Owners of apartments subject to rent stabilization or rent control must file electronically the DHCR Form
RN–19N INDIVIDUAL APARTMENT IMPROVEMENT: NOTIFICATION, for IAIs made in vacant and
occupied apartments. The Notification Form needs to be accompanied by before and after photographs.
This Notification and accompanying photographs will be made part of the rent registration record for a
rent stabilized apartment and part of the Maximum Base Rent building profile record for a rent controlled
apartment. Pursuant to HSTPA, such Notification for each IAI must include an itemized list of work
performed and a description or explanation of the reason or purpose of such work. DHCR retains the right
to request any relevant information even if provided previously, where it affects the adjustment of legal
regulated rents. While HSTPA requires the filing of documentation pertaining to IAIs, it also specifically
states that such filings do not relieve an owner of his or her duty to retain proper documentation of all
improvements performed or any rent increases resulting from IAIs.