(ii) the local housing agency with cooperation of the division of housing and community renewal shall monitor and enforce compliance with the filing requirements of this section; (iii) the local housing agency shall create a report which, at a minimum, contains the following information for every building which receives benefits pursuant to this section:  address, commencement and termination date of the benefits, total number of residential units, number of “421-a units” and number of “421-a affordable units”, apartment number or other designation of such units and the rent for each of such units.  The local housing agency with the cooperation of the division of housing and community renewal shall maintain, and update such report no less than annually, with information secured from annual registrations.  Such reports shall be available for public inspection in a form that assigns a unique designation to each unit other than its actual apartment number to maintain the privacy of such information;  and (iv) the local housing agency shall monitor any change in such information, shall investigate any such changes which indicate a failure to comply with the provisions of this section, and shall take appropriate action based on its findings. - http://codes.findlaw.com/ny/real-property-tax-law/rpt-sect-421-a.html