Capital gain in case of premises depreciated in earlier year

An Assessee (Partnership Firm) had 2 Premises in a block which were Depreciated as per IT rules till 31.03.2003.

Subsequently the Business was discontinued after 31.03.2003  and the Depreciation was not claimed in subsequent years in the Computing the Total Income of the Assessee.

Further Both the Premises were sold in A.Y. 2012-13.

Can Anybody tell me that what cost shall be reduced from the Sales consideration to compute the Capital Gains.

-Whether WDV as on 31.03.2003

OR

-Amount arrived after providing notional depreciation from A.Y. 2005-06 to 2011-12