SECTION 906 CERTIFICATIONS

We, Peter E. Sundman,  Chief Executive Officer, and John M. McGovern,  Treasurer
and Principal  Financial and Accounting Officer, of Neuberger Berman Real Estate
Securities  Income  Fund Inc.  ("Registrant"),  certify,  pursuant  to 18 U.S.C.
Section 1350 enacted under Section 906 of the  Sarbanes-Oxley  Act of 2002, that
to our knowledge:

          1.     The Registrant's periodic report on Form N-CSR for the period
                 ended April 30, 2006 fully complies with the requirements of
                 Section 13(a) or 15(d) of the Securities Exchange Act of 1934
                 (15 U.S.C. Section 78m(a) or 78o(d)); and

          2.     The information contained in such Form N-CSR fairly presents,
                 in all material respects, the financial condition and results
                 of operations of the Registrant.

Dated:  July 10, 2006

                                                /s/ Peter E. Sundman
                                                -----------------------
                                                Peter E. Sundman
                                                Chief Executive Officer


                                                /s/ John M. McGovern
                                                -----------------------
                                                John M. McGovern
                                                Treasurer and Principal
                                                Financial and Accounting Officer

A signed  original of this written  statement  required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the  electronic  version of this written  statement
required  by  Section  906,  has been  provided  to the  Registrant  and will be
retained  by the  Registrant  and  furnished  to  the  Securities  and  Exchange
Commission or its staff upon request.

This  certification  is being furnished to the Commission  solely pursuant to 18
U.S.C.  ss.  1350 and is not  being  filed as part of the  Form  N-CSR  with the
Commission.