SOURCE ONE MORTGAGE SERVICES CORP
8-K, 1998-03-31
ASSET-BACKED SECURITIES
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<PAGE>   1
                     SECURITIES AND EXCHANGE COMMISSION

                           WASHINGTON, D.C. 20549

                                      

                               ---------------

                                      
                                  FORM 8-K

                               CURRENT REPORT

                   Pursuant to Section 13 or 15 (d) of the
                       Securities Exchange Act of 1934


Date of Report:  March 24, 1998




                  Source One Mortgage Services Corporation
           (Exact name of registrant as specified in its charter)
<TABLE>
<CAPTION>


               Delaware                               1-12898                             38-2011419
               --------                               -------                             ----------
      <S>                                    <C>                                      <C>
     (State or other jurisdiction            (Commission File Number)                  (I.R.S. Employer
           of incorporation)                                                          Identification No.)

         27555 Farmington Road                                                            48334-3357
      Farmington Hills, Michigan                                                          ----------
      ------------------------                                                            (Zip Code) 
         (Address of principal
          executive offices)
</TABLE>


Registrant's telephone number, including area code:  (248) 488-7000


Total Pages:  8



<PAGE>   2
Item 5.  Other Events

         None applicable.


Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits

         See attached Distribution Reports as of March 25, 1998 for Series
         1987-1 and 1987-2, Distribution Reports as of April 1, 1998 for Series
         1988-1 and 1988-2 and Distribution Reports as of March 20, 1998 for
         Series 1990-1.




                                  Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                 SOURCE ONE MORTGAGE SERVICES CORPORATION
                                                    (Registrant)




Date:  March 24, 1998                 By: Larry N. Ciofu
                                          -------------------------------
                                          Larry N. Ciofu
                                          Vice President












<PAGE>   3
                      FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                 SERIES 1987-1

              Distribution Date Statement for    March  25, 1998


                                                                
                                                                
          COUPON      Principal     Number of      Interest     
 Class     RATE      Outstanding   Certificates    Payable      
- ------------------ -------------------------------------------- 
   A       6.7375%   $8,173,843.85      62,500     $137,678.18  
                                                                
   B       6.0000%           $0.00      13,700           $0.00  
                                                                
   C       6.0000%           $0.00      26,900           $0.00  
                                                                
   D       6.0000%   $8,173,843.86      21,900     $122,607.66  
                   -------------------------------------------  
                    $16,347,687.71     125,000     $260,285.84  
                                                                
                                                                
                                                                
*Aggregate Cash Flow Value Decline:                $802,461.10  
Ending Aggregate Agency MBS Balance:            $15,548,083.88  
                                                                
                                                                
        Agency MBS Collections :                                
             Interest                              $383,720.46  
             Principal                             $802,461.10  
        Investment Income                            $5,989.27  
                                               ---------------  
        TOTAL AVAILABLE                          $1,192,170.83  
                                                                
        Due to Certificateholders               ($1,062,746.94) 
                                                                
        Expenses Payable                            ($5,574.52) 
                                               ---------------  
        Due to Residual Holders                    $123,849.37  
                                               ===============   
                                                                
        Amount Payable Per Individual                           
        Residual Certificate (5% Denomination):    $6,192.4685  
                                               

<TABLE>                                        
<CAPTION>                                                                            Principal
                                                                                     Balance
             Interest                              Principal        Principal        Per $1,000        
           Payable Per       Principal            Payable Per     Balance After      CTF After         
 Class      $1,000 CTF        Payable*            $1,000 CTF     March  25, 1998     March  25, 1998   
- -------  ---------------- ----------------      ---------------  ----------------    ----------------  
<S>            <C>        <C>                       <C>          <C>                 <C>               
   A           $2.202851      $401,230.55            $6.419689     $7,772,613.30         $124.361813   
                                                                                                       
   B           $0.000000            $0.00            $0.000000             $0.00           $0.000000   
                                                                                                       
   C           $0.000000            $0.00            $0.000000             $0.00           $0.000000   
                                                                                                       
   D           $5.598523      $401,230.55           $18.321030     $7,772,613.31         $354.913850   
                          ---------------                        ---------------                       
                              $802,461.10                         $15,545,226.61                       



                      Principal Allocation Class A:       50.00000% 
                                           Class D:       50.00000% 
                                               
                                               
                                               
                                                                 THE FIRST NATIONAL BANK OF CHICAGO,   
                                                                 as Trustee                            
                                                                 Corporate Trust Division              
                                                                 Suite 0126                            
                                                                 One First National Plaza              
                                                                 Chicago, Illinois  60670              
                                                                 (312)407-4660                         
</TABLE>



<PAGE>   4
                     FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                SERIES 1987-2

               Distribution Date Statement for March  25, 1998

                                                                              
       COUPON     Principal      Number of     Interest        Interest       
Class   RATE     Outstanding    Certificates   Accrued         Payable        
- ----- -------- ---------------- ----------- -------------- ----------------   
 2-A   0.0000%           $0.00      45,100          $0.00            $0.00    
                                                                              
 2-B   7.0000%           $0.00      18,000          $0.00            $0.00    
                                                                              
 2-C   7.0000%           $0.00      19,700          $0.00            $0.00    
                                                                              
 2-D   9.5500%           $0.00         124          $0.00            $0.00    
                                                                              
 2-E   9.9500%  $10,575,214.54       5,200     $87,686.15       $87,686.15    
               ---------------  ----------  -------------  ---------------    
                $10,575,214.54      88,124     $87,686.15       $87,686.15    
                                                                              
                                                                              
      Agency MBS Collections :                                                
              Interest                                          $88,291.69    
              Principal                                        $221,774.76    
      Investment Income                                            $196.04    
                                                                              
                                                           ---------------    
      TOTAL AVAILABLE                                          $310,262.49    
                                                                              
      Due   to Certificateholders                              $309,460.91    
                                                                              
                                                           ---------------    
      Available for Expenses and Residual Payments                 $801.58    
                                                                              
      Expenses Payable                                            ($270.61)   
                                                                              
                                                           ---------------    
      Net Balance                                                  $530.97    
                                                           ===============    
                                                                              
                                                                              
      Due to Residual Holders                                      $530.97    
                                                                              
      Amount Payable Per Individual                                           
      Residual Certificate (5% Denomination):                     $26.5485    


<TABLE>
<CAPTION>

         Interest                       Principal         Principal         Per $1,000       
       Payable Per     Principal       Payable Per       Balance After      CTF After        
Class   $1,000 CTF      Payable         $1,000 CTF     March  25, 1998      March  25, 1998  
- -----  ------------  --------------  ----------------  -----------------    ---------------- 
 <S>   <C>           <C>             <C>                <C>                 <C>                             
 2-A     $0.000000                         $0.000000                              $0.000000  
                                                                                             
 2-B     $0.000000                         $0.000000                              $0.000000  
                                                                                             
 2-C     $0.000000                         $0.000000                              $0.000000  
                                                                                             
 2-D     $0.000000           $0.00          -                     $0.00           $0.000000  
                                                                                             
 2-E    $16.862721     $221,774.76        $42.648992     $10,353,439.78       $1,991.046112  
                     -------------                     ----------------                      
                       $221,774.76                       $10,353,439.78                      
                                                                                             
       Ending Aggregate Agency MBS Balance:              $10,373,230.90                      


       Accrual Distribution Amount:                               $0.00                      
       Aggregate Cash Flow Value Decline:                   $221,774.76                      


                                                       THE FIRST NATIONAL BANK OF CHICAGO,   
                                                       as Trustee                            
                                                       Corporate Trust Division              
                                                       Suite 0126                            
                                                       One First National Plaza              
                                                       Chicago, Illinois  60670              
                                                       (312)407-4660                         
                                                                                             
           ** THIS IS A REDEMPTION PAYMENT TO SPECIFIC HOLDERS ELECTING A PUT OPTION.        

</TABLE>


     
<PAGE>   5
                     FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                SERIES 1988-1

                Distribution Date Statement for April  1, 1998

                                                                             
                                                                             
       COUPON     Principal      Number of     Interest        Interest      
Class   RATE     Outstanding    Certificates   Accrued         Payable       
- ----- -------- ---------------- ----------- -------------- ----------------  
  A    0.0000%           $0.00      38,510          $0.00            $0.00   
                                                                             
  B    8.0000%           $0.00      51,050          $0.00            $0.00   
                                                                             
  Z    9.9000%  $10,680,422.96      10,440     $88,113.49       $88,113.49   
               ---------------  ----------  -------------  ---------------   
                $10,680,422.96     100,000     $88,113.49       $88,113.49   
                                                                             
                                                                             
                                                                             
      Agency MBS Collections :                                               
              Interest                                          $89,005.74   
              Principal                                        $246,769.37   
      Investment Income                                            $389.49   
                                                           ---------------   
      TOTAL AVAILABLE                                          $336,164.60   
                                                                             
      Due to Certificateholders                               ($334,882.86)  
                                                           ---------------   
      Available for Expenses and Residual Payments               $1,281.74   
                                                                             
      Expenses Payable                                            ($274.85)  
                                                                             
                                                           ---------------   
      Net Balance                                                $1,006.89   
                                                           ===============   
                                                                             
                                                                             
      Due to Residual Holders                                    $1,006.89   
                                                                             
      Amount Payable Per Individual                                          
      Residual Certificate (5% Denomination):                     $50.3445   



<TABLE>
<CAPTION>
                                                                     Principal Balance 
          Interest                    Principal       Principal      Per $1,000        
        Payable Per    Principal     Payable Per    Balance After    CTF After         
Class    $1,000 CTF     Payable*      $1,000 CTF   April  1, 1998    April  1, 1998    
- -----   ------------ --------------  ------------  ----------------  ----------------  
  <S>   <C>          <C>             <C>           <C>               <C>                              
  A       $0.000000          $0.00     $0.000000             $0.00         $0.000000   
                                                                                       
  B       $0.000000          $0.00     $0.000000             $0.00         $0.000000   
                                                                                       
  Z       $8.439989    $246,769.37    $23.636913    $10,433,653.59       $999.392106   
                     -------------                 ---------------                     
                       $246,769.37                  $10,433,653.59                     


        Ending Aggregate Agency MBS Balance:        $10,433,921.12                     


                     Accrual Distribution Amount:                              $0.00   
                     Aggregate Cash Flow Value Decline:                  $246,769.37   
                                                                     ---------------   
                     *Aggregate Amount of Principal Distributable:       $246,769.37   
        
        

                                                   THE FIRST NATIONAL BANK OF CHICAGO, 
                                                   as Trustee                          
                                                   Corporate Trust Division            
                                                   Suite 0126                          
                                                   One First National Plaza            
                                                   Chicago, Illinois  60670            
                                                   (312)407-4660                       
        
</TABLE>      
<PAGE>   6
                     FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                SERIES 1988-2
                Distribution Date Statement for         April  1, 1998



<TABLE>
<CAPTION>
                                                                             
                                                                             
       COUPON     Principal      Number of     Interest        Interest      
Class   RATE     Outstanding    Certificates   Accrued         Payable       
- ----- -------- ---------------- ----------- -------------- ----------------  
 <S>  <C>         <C>           <C>         <C>             <C>                          
 2-A   0.0000%           $0.00      39,750          $0.00            $0.00   
                                                                             
 2-B   7.0000%           $0.00      24,540          $0.00            $0.00   
                                                                             
 2-C   7.0000%           $0.00      10,930          $0.00            $0.00   
                                                                             
 2-D   7.0000%           $0.00      14,580          $0.00            $0.00   
                                                                             
 2-Z   9.4000%  $13,181,036.19      10,200    $103,251.45      $103,251.45   
               ---------------  ----------  -------------  ---------------   
                $13,181,036.19     100,000    $103,251.45      $103,251.45   
                                                                             
                                                                             
                                                                             
      Agency MBS Collections :                                               
              Interest                                         $104,349.97   
              Principal                                        $186,008.72   
      Investment Income                                            $579.20   
                                                           ---------------   
      TOTAL AVAILABLE                                          $290,937.89   
                                                                             
      Due to Certificateholders                               ($289,260.17)  
                                                           ---------------   
      Available for Expenses and Residual Payments               $1,677.72   
                                                                             
      Expenses Payable                                            ($319.10)  
                                                                             
      Net Balance                                                $1,358.62   
                                                           ===============   
                                                                             
                                                                             
      Due to Residual Holders                                    $1,358.62   
                                                                             
      Amount Payable Per Individual                                          
      Residual Certificate (5% Denomination):                     $67.9310   
</TABLE>

<TABLE>
<CAPTION>
                                                                       Principal Balance    
           Interest                     Principal       Principal      Per $1,000                           
         Payable Per     Principal     Payable Per    Balance After    CTF After                            
Class     $1,000 CTF     Payable*       $1,000 CTF   April  1, 1998    April  1, 1998                       
- -----    ------------ ---------------  ------------  ----------------  ----------------                     
 <S>     <C>          <C>              <C>           <C>               <C>                                  
 2-A       $0.000000           $0.00     $0.000000             $0.00         $0.000000                      
                                                                                                            
 2-B       $0.000000           $0.00     $0.000000             $0.00         $0.000000                      
                                                                                                            
 2-C       $0.000000           $0.00     $0.000000             $0.00         $0.000000                      
                                                                                                            
 2-D       $0.000000           $0.00     $0.000000             $0.00         $0.000000                      
                                                                                                            
 2-Z      $10.122691     $186,008.72    $18.236149    $12,995,027.47     $1,274.022301                      
                      --------------                 ---------------                                        
                         $186,008.72                  $12,995,027.47                                        
                                                                                                            
                                                                                                         
                     Ending Aggregate Agency MBS Balance:         $12,995,042.22                     
                                                                                                     
                                                                                                     
                                  Accrual Distribution Amount:                               $0.00   
                                  Aggregate Cash Flow Value Decline:                   $186,008.72   
                                                                                   ---------------   
                                  *Aggregate Amount of Principal Distributable:        $186,008.72   
                                                                                                     
                                  Principal Allocation:          Class 2-A:                 0.0000%  
                                                                 Class 2-D:                 0.0000%  
                                                                                                     
                                                                                                     
                                                                                                     
                                                                 THE FIRST NATIONAL BANK OF CHICAGO, 
                                                                 as Trustee                          
                                                                 Corporate Trust Division            
                                                                 Suite 0126                          
                                                                 One First National Plaza            
                                                                 Chicago, Illinois  60670            
                                                                 (312)407-4660                       
                                                                                                     
                                                                                                     
     
</TABLE>


<PAGE>   7
                      FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                 SERIES 1990-1

               Distribution Date Statement for March 20, 1998

                     UPPER TIER REMIC REGULAR CERTIFICATES




<TABLE>
<CAPTION>
                                                                           
       COUPON      Principal      Number of    Interest      Interest      
Class   RATE      Outstanding    Cert.         Accrued       Payable       
- ----- --------- ---------------- ----------- ------------ --------------   
<S>  <C>       <C>               <C>         <C>          <C>          
 1-A    8.5000%           $0.00      15,250        $0.00          $0.00    
                                                                           
 1-B    9.0000%           $0.00      10,500        $0.00          $0.00    
                                                                           
 1-C    9.0000%           $0.00       6,500        $0.00          $0.00    
                                                                           
 1-D    9.0000%           $0.00      16,500        $0.00          $0.00    
                                                                           
 1-E    9.0000%   $9,013,221.81      12,000   $67,599.16     $67,599.16    
                                                                           
 1-F    0.0000%           $0.00      18,500        $0.00          $0.00    
                                                                           
 1-G    0.0000%           $0.00      12,450        $0.00          $0.00    
                                                                           
 1-H    0.0000%           $0.00       4,850        $0.00          $0.00    
                                                                           
 1-I  259.5000%      $18,026.45         152    $3,898.22      $3,898.22    
                ---------------  ----------  -----------  -------------    
                  $9,031,248.26      96,702   $71,497.38     $71,497.38    
</TABLE>


<TABLE>
<CAPTION>
                                                                          Principal Balance 
           Interest                       Principal       Principal       Per $1,000        
          Payable Per      Principal     Payable Per     Balance After    CTF After         
Class     $1,000 CTF        Payable*      $1,000 CTF   March  20, 1998    March  20, 1998   
- -----  ----------------- --------------  ------------  -----------------  ----------------  
<S>    <C>               <C>             <C>           <C>                <C>       
 1-A          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-B          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-C          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-D          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-E          $5.633263    $317,735.17    $26.477931      $8,695,486.64       $724.623887   
                                                                                            
 1-F          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-G          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-H          $0.000000          $0.00     $0.000000              $0.00         $0.000000   
                                                                                            
 1-I         $25.646184        $635.47     $4.180724         $17,390.98       $114.414342   
                         -------------                 ----------------                     
                           $318,370.64                    $8,712,877.62                     
</TABLE>                                                              
      
      

<TABLE>
<CAPTION>
                       UPPER TIER REMIC REGULAR CERTIFICATES
                                                                 
                                                                        
                                                                        
       COUPON      Principal      Number of    Interest      Interest   
        RATE      Outstanding    Cert.         Accrued       Payable    
      --------- ---------------- ----------- ------------ --------------
 <S>    <C>     <C>               <C>         <C>          <C>
 1-R    0.0000%           $0.00       3,298        $7.97          $7.97 
                                                                        
</TABLE>

<TABLE>
<CAPTION>

                             UPPER TIER REMIC REGULAR CERTIFICATES


                                                                         Principal Balance
          Interest                       Principal       Principal       Per $1,000       
         Payable Per      Principal     Payable Per     Balance After    CTF After        
         $1,000 CTF        Payable*      $1,000 CTF   March  20, 1998    March  20, 1998  
      ----------------- --------------  ------------  -----------------  ---------------- 
 <S>    <C>             <C>              <C>           <C>               <C>
 1-R         $0.002417          $0.00     $0.000000              $0.00         $0.000000  
                                                                                          
     
</TABLE>


<TABLE>
<CAPTION>
                             LOWER TIER REMIC REGULAR INTERESTS
                                                                 
                                                                             Principal
       COUPON      Principal      Number of    Interest     Principal       Balance After
Class   RATE      Outstanding    Certificates  Accrued       Payable*      March  20, 1998                   
- ----- --------- ---------------- ----------- ------------ --------------  -----------------                  
<S>     <C>      <C>             <C>          <C>          <C>            <C>
1-AS    9.5000%           $0.00      15,311        $0.00          $0.00              $0.00

1-BS    9.5000%           $0.00      10,521        $0.00          $0.00              $0.00

1-CS    9.5000%           $0.00       6,513        $0.00          $0.00              $0.00

1-DS    9.5000%           $0.00      16,533        $0.00          $0.00              $0.00

1-ES    9.5000%   $9,986,363.86      12,024   $74,674.61    $318,370.64      $9,667,993.22

1-FS    9.5000%           $0.00      30,950        $0.00          $0.00              $0.00

1-HS    9.5000%           $0.00       8,148        $0.00          $0.00              $0.00

                ---------------  ----------  -----------  -------------   ---------------- 
                  $9,986,363.86     100,000   $74,674.61    $318,370.64      $9,667,993.22
</TABLE>


<PAGE>   8
                     FIREMAN'S FUND MORTGAGE CORPORATION
               AGENCY MBS MULTI-CLASS PASS-THROUGH CERTIFICATES
                                SERIES 1990-1
               DISTRIBUTION DATE STATEMENT FOR March  20, 1998


                                                                          
      Agency MBS Collections :                                            
               Interest                                        $71,505.35
               Principal                                      $318,370.64
      Investment Income                                            $61.35
                                                          ---------------
      Lower Tier REMIC Collection Account                     $389,937.34
                                                          ---------------
      Upper Tier REMIC Collection Account                     $389,937.34
                                                                         
      Aggregate Prin Payable to Holders of                               
      Upper Tier REMIC Regular Certificates                  ($318,370.64)
                                                                         
      Aggregate Interest Payable to Holders of                           
      Upper Tier REMIC Regular Certificates                   ($71,497.38)
                                                                         
      Expenses Payable                                              $0.00
                                                                         
                                                                         
                                                                         
      REMIC Taxes Payable                                           $0.00
                                                                         
      Interest Payable to Class 1-R Certificate                    ($7.97)
                                                                         
                                                                         
                                                                         
      Principal Payable to Class 1-R Certificate                    $0.00
                                                                         
      Due to Class 1-RS Certificate                               ($61.35)
                                                          ---------------
      Net Balance                                                  ($0.00)
                                                          ===============
                                                                         



      Beginning Aggregate Agency MBS Balance :            $100,001,006.61  
      Ending Aggregate Agency MBS Balance :                 $8,713,884.05  
                                                                         
                                                                         
       Aggregate Cash Flow Value Decline:                     $318,370.63  
                                                          ---------------  
       *Aggregate Amount of Principal Distributable:          $318,370.63  
                                                                          
                                                                         
                                                                         
       Principal Allocation:                                             
                                                                         
                                                                         
       Aggregate Amount of Principal                                     
       Distributable to Classes 1-D and 1-I:                             
                                                                         
                                                                         
       Class 1-E:               2.64779300%                              
       Class 1-I:               0.41807237%                              
                                                                         
       Aggregate Amount of Principal                                     
       Distributable to Classes 1-G,1-H and 1-R :                        
                                                                         
       Class 1-R:               0.00000000%                              
                                                                         
                                                                         
       THE FIRST NATIONAL BANK OF CHICAGO,                               
       as Trustee                                                        
       Corporate Trust Division                                          
       Suite 0126                                                        
       One First National Plaza                                          
       Chicago, Illinois  60670                                          
       (312)407-4660                                                      
                                                                          
                                                                          
                                                                          
                                                                          


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