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SIGNATURE WILLIAM B. FRELS
TITLE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ANNUAL
REPORT DATED DECEMBER 31, 1999
</LEGEND>
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[LETTERHEAD OF ERNST & YOUNG]
Report of Independent Auditors
Board of Directors
of Mairs and Power Balanced Fund, Inc.
In planning and performing our audit of the financial statements of Mairs and
Power Balanced Fund, Inc. (the "Fund") for the year ended December 31, 1999, we
considered its internal control, including control activities for safeguarding
securities, to determine our auditing procedures for the purpose of expressing
our opinion on the financial statements and to comply with the requirements of
Form N-SAR, and not to provide assurance on internal control.
The management of the Fund is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
internal control. Generally, internal controls that are relevant to an audit
pertain to the entity's objective of preparing financial statements for external
purposes that are fairly presented in conformity with generally accepted
accounting principles. Those internal controls include the safeguarding of
assets against unauthorized acquisition, use or disposition.
Because of inherent limitations in any internal control, misstatements due to
errors or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
internal control may become inadequate because of changes in conditions, or that
the degree of compliance with the policies and procedures may deteriorate.
Our consideration of internal control would not necessarily disclose all matters
in internal control that might be material weaknesses under standards
established by the American Institute of Certified Public Accountants. A
material weakness is a condition in which the design or operation of one or more
of the specific internal control components does not reduce to a relatively low
level the risk that errors or fraud in amounts that would be material in
relation to the financial statements being audited may occur and not be detected
within a timely period by employees in the normal course of performing their
assigned functions. However, we noted no matters involving internal control,
including control activities for safeguarding securities, and its operation that
we consider to be material weaknesses as defined above at December 31, 1999.
<PAGE>
-2-
This report is intended solely for the information and use of the board of
directors and management of Mairs and Power Balanced Fund, Inc. and the
Securities and Exchange Commission and is not intended to be and should not be
used by anyone other than these specified parties.
/s/ Ernst & Young LLP
January 24, 2000
