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 (Date of earliest event reported):        April 1, 1998      



                       FIRST EMPIRE STATE CORPORATION                      
            (Exact name of registrant as specified in its charter)
                                                      

                                      New York                             
                 (State or other jurisdiction of incorporation)


           1-9861                                      16-0968385            
(Commission File Number)                  (I.R.S. Employer Identification No.)



One M&T Plaza, Buffalo, New York                                    14240
   (Address of principal executive offices)                      (Zip Code)


Registrant's telephone number, including area code:            (716) 842-5445



                                  (NOT APPLICABLE)
           (Former name or former address, if changed since last report)
           






Item 2.  Acquisition or Disposition of Assets.

     On April 1, 1998, First Empire State Corporation ("First Empire")
consummated the merger (the "Merger") of ONBANCorp, Inc. ("ONBANCorp") with and
into Olympia Financial Corp. ("Olympia"), a wholly owned subsidiary of First
Empire, pursuant to the Agreement and Plan of Reorganization dated as of October
28, 1997 by and among First Empire, Olympia and ONBANCorp (the "Reorganization
Agreement").  Disclosure that First Empire, Olympia and ONBANCorp had entered
into the Reorganization Agreement was previously reported by First Empire in its
Current Report on Form 8-K dated October 28, 1997.

     After application of the election, allocation and proration procedures 
contained in the Agreement and Plan of Merger (the "Merger Agreement") set 
forth as Annex A to the Reorganization Agreement, the aggregate consideration 
for the Merger consisted of 1,429,998 shares of First Empire common stock and 
approximately $266 million in cash. On April 2, 1998, the total number of 
shares of First Empire common stock outstanding, including the shares issued 
in connection with the Merger, was 8,100,085.

     Following the Merger, OnBank & Trust Co., ONBANCorp's commercial bank
subsidiary, and Franklin First Savings Bank, ONBANCorp's savings bank
subsidiary, were merged (the "Bank Merger") with and into Manufacturers and
Traders Trust Company ("M&T Bank"), which had become a wholly owned subsidiary
of Olympia.  As a result of the Bank Merger, M&T Bank acquired 59 banking
offices formerly operated by OnBank & Trust Co. in the Syracuse, Rochester and
Albany areas of New York State, and 19 banking offices formerly operated by
Franklin First Savings Bank in Northeastern Pennsylvania.  

     Upon consummation of the Merger, Robert J. Bennett, William F. Allyn,
Russell A. King, Peter J. O'Donnell, Jr. and John L. Vensel, all formerly
directors of ONBANCorp, became directors of First Empire and M&T Bank.  In
addition, Mr. Bennett, formerly Chairman, President and Chief Executive Officer
of ONBANCorp, became Chairman of the Board of Directors of First Empire and a
Vice Chairman of M&T Bank.  Robert G. Wilmers, who had been Chairman of the
Board of Directors of First Empire, will continue as First Empire's President
and Chief Executive Officer and will remain M&T Bank's Chairman and Chief
Executive Officer.

     The foregoing description of the Merger is qualified in its entirety by
reference to the Reorganization Agreement filed as Exhibit 2 to First Empire's
Current Report on Form 8-K dated October 28, 1997 and the Merger Agreement filed
as Exhibit 2 to First Empire's Current Report on Form 8-K dated January 9, 1998.

     First Empire's announcement of the Merger was made by means of a news 
release, a copy of which is set forth as Exhibit 99.1 hereto and incorporated 
herein by reference.

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Item 7.   Financial Statements and Exhibits.

     (a)  The audited consolidated financial statements of ONBANCorp and its 
subsidiaries as of December 31, 1997 and 1996 and for each of the years ended 
December 31, 1997, 1996 and 1995, included in ONBANCorp's Annual Report on 
Form 10-K for the year ended December 31, 1997, are hereby incorporated by 
reference, together with the report of KPMG Peat Marwick LLP, independent 
auditors, on such financial statements.

     The pro forma financial information required to be filed by Item 7 (b) 
to Form 8-K shall be filed under cover of Form 8 as soon as practicable, but 
not later than 60 days after this Current Report on Form 8-K would otherwise 
be required to be filed.  

     (b)  The following exhibits are filed herewith or incorporated by reference
herein as a part of this report:

          Exhibit No.

                 2.1     Agreement and Plan or Reorganization dated as of
                         October 28, 1997 by and among First Empire State
                         Corporation, Olympia Financial Corp. and ONBANCorp,
                         Inc.  Incorporated by reference to Exhibit No. 2 to the
                         Current Report on Form 8-K dated October 28, 1997 of
                         First Empire State Corporation (File No. 1-9861).

                 2.2     Agreement and Plan of Merger, dated as of October 28,
                         1997, by and among First Empire State Corporation,
                         Olympia Financial Corp. and ONBANCorp, Inc. 
                         Incorporated by reference to Exhibit No. 2 to the
                         Current Report on Form 8-K dated January 9, 1998 of
                         First Empire State Corporation (File No. 1-9861).

                  23     Consent of KPMG Peat Marwick LLP, independent auditors
                         to ONBANCorp, Inc.  Filed herewith.

                  99.1   Press Release, dated April 1, 1998.  Filed herewith.

                  99.2   ONBANCorp, Inc. 1997 audited Financial Statements,
                         together with the Report of the Independent Auditors
                         thereon.  Incorporated by reference to the Annual
                         Report on Form 10-K of ONBANCorp, Inc. for the year
                         ended December 31, 1997 (File No. 0-18011).


                                               3





                              SIGNATURES


     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 hereunto duly authorized.



                                   FIRST EMPIRE STATE CORPORATION



Date: April 9, 1998                By: /s/ Michael P. Pinto
                                      ------------------------
                                   Michael P. Pinto 
                                   Executive Vice President 
                                   and Chief Financial Officer







                                          4







                                  CURRENT REPORT




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




Report Dated:   April 1, 1998                 Commission File Number: 1-9861






                            FIRST EMPIRE STATE CORPORATION
              (Exact name of registrant as specified in its charter)






                                    EXHIBITS





                                          5






EXHIBIT INDEX


    Exhibit No.                                                        Page No.

     2.1  Agreement and Plan or Reorganization dated as of                 --
          October 28, 1997 by and among First Empire State 
          Corporation, Olympia Financial Corp. and ONBANCorp,
          Inc.  Incorporated by reference to Exhibit No. 2 to the 
          Current Report on Form 8-K dated October 28, 1997
          of First Empire State Corporation (File No. 1-9861).

     2.2  Agreement and Plan of Merger, dated as of October 28, 1997,      --
          by and among First Empire State Corporation, Olympia 
          Financial Corp. and ONBANCorp, Inc.  Incorporated by 
          reference to Exhibit No. 2 to the Current Report on Form 
          8-K dated January 9, 1998 of First Empire State Corporation
          (File No. 1-9861).

     23   Consent of KPMG Peat Marwick LLP, independent auditors to        7
          ONBANCorp, Inc.  Filed herewith.

     99.1 Press Release, dated April 1, 1998.  Filed herewith.             8
          

     99.2 ONBANCorp, Inc. 1997 audited Financial Statements, together      --
          with the Report of the Independent Auditors thereon.  
          Incorporated by reference to the Annual Report on Form 
          10-K of ONBANCorp, Inc. for the year ended December 31,
          1997 (File No. 0-18011).




                                          6














                                                                  EXHIBIT No. 23

CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
First Empire State Corporation as successors to ONBANCORP, INC.:

We consent to incorporation by reference in the Current Report on Form 8-K of 
First Empire State Corporation of our report dated January 26, 1998, relating 
to the consolidated balance sheets of ONBANCorp, Inc. and subsidiaries as of 
December 31, 1997 and 1996, and the related consolidated statements of income, 
changes in shareholders' equity, and cash flows for each of the years in the 
three-year period ended December 31, 1997, which report is incorporated by 
reference in the December 31, 1997 annual report on Form 10-K of ONBANCorp, Inc.



                                        /s/ KPMG Peat Marwick LLP
                                        --------------------------
                                        KPMG Peat Marwick LLP
                                        Syracuse, New York

April 8, 1998





                                          7



                                                               Exhibit No. 99.1

Contact:  Gary S. Paul                                     FOR IMMEDIATE RELEASE
          (716) 842-5130                                   April 1, 1998

                       FIRST EMPIRE STATE CORPORATION AND
                         ONBANCORP, INC. COMPLETE MERGER

SYRACUSE AND BUFFALO, NEW YORK (April 1, 1998) --  First Empire State
Corporation ("First Empire") (AMEX:FES), Buffalo, New York today completed the
acquisition of ONBANCorp, Inc.  ("ONBANCorp") (NASDAQ:ONBK), Syracuse, New York
and merged ONBANCorp's two banking subsidiaries, OnBank & Trust Co. (Syracuse,
New York) and Franklin First Savings Bank (Wilkes-Barre, Pennsylvania), into
Manufacturers and Traders Trust Company ("M&T Bank"), First Empire's principal
commercial bank subsidiary.  All 78 former ONBANCorp banking offices began
operating as offices of M&T Bank today.  As a result of the acquisition, First
Empire will have the largest share of deposits in upstate New York north of
Westchester County.  First Empire now has 255 banking offices in New York State
and northeastern Pennsylvania and nearly $20 billion in total assets.

Former ONBANCorp chairman, president and chief executive officer Robert J.
Bennett becomes chairman of the board of directors of First Empire State
Corporation and vice chairman of the board of directors of M&T Bank.  Bennett
said, "I am pleased to be a part of this fine organization.  Our expanded
upstate New York and northeastern Pennsylvania presence will provide customers
with the best possible products and services."

Robert G. Wilmers, who will continue as president and chief executive officer of
First Empire and as chairman and chief executive officer of M&T Bank noted,
"First Empire welcomes our newest stockholders to our organization.  Combining
with ONBANCorp has enabled us to create a banking franchise with enhanced
financial resources, product diversity and market presence to compete more
effectively.  We want to extend to our new customers our commitment to being
'All the bank you'll ever need'."
                                       
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First Empire acquired ONBANCorp for stock and cash, with 70 percent of the
outstanding ONBANCorp shares being exchanged for First Empire common stock at a
ratio of 0.161 of a First Empire share for each ONBANCorp common share. 
Approximately 1,430,000 shares of First Empire common stock will be issued. 
Each of the remaining 30 percent of ONBANCorp common shares will be exchanged
for $69.50 in cash.  The merger was structured as a tax-free exchange for
stockholders receiving stock and was accounted for as a purchase transaction.  

Stockholders who made stock elections will receive 77.01379% of their stock
elections in First Empire common stock (with fractional shares being paid in
cash), and the remaining 22.98621% of their stock elections will be converted to
cash at $69.50 for each share of ONBANCorp common stock.  Based on yesterday's
closing price of $499.875 per First Empire share, this equates to $77.96 for
each share of ONBANCorp common stock.

Stockholders who made cash elections will receive $69.50 for each share of
ONBANCorp common stock.

Stockholders who made no election, failed to surrender ONBANCorp common stock
certificates or other required election documents, or whose election documents
were not received by the Exchange Agent by 5:00 p.m. on Tuesday, March 24, 1998
will receive $69.50 for each share of ONBANCorp common stock.

First Empire is also the parent company of M&T Bank, N.A. (Oakfield, New York).