<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
registrant's unaudited consolidated financial statements as of September 30,
2000, and the three months then ended, and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> SEP-30-2000
<CASH> 4,350
<SECURITIES> 0
<RECEIVABLES> 195,354
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 199,704
<PP&E> 1,702,059
<DEPRECIATION> 122,844
<TOTAL-ASSETS> 1,778,919
<CURRENT-LIABILITIES> 97,938
<BONDS> 878,265
0
0
<COMMON> 0
<OTHER-SE> 802,716
<TOTAL-LIABILITY-AND-EQUITY> 1,778,919
<SALES> 191,335
<TOTAL-REVENUES> 198,080
<CGS> 0
<TOTAL-COSTS> 107,281
<OTHER-EXPENSES> 3,513 <F1>
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 34,714
<INCOME-PRETAX> 52,572
<INCOME-TAX> 0
<INCOME-CONTINUING> 52,572
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 52,572
<EPS-BASIC> 1.70
<EPS-DILUTED> 1.69
<FN>
<F1>
Included in other expenses are minority interest expense and gain/(loss) on
exchange of self-storage facilities
</FN>
</TABLE>