All forms of deregulations, except for 421-a (16) apartments, were repealed as of June 14, 2019. For apartments
which were previously deregulated pursuant to high-rent vacancy, a listing of IAIs and their total cost were
required to be included in the notice of deregulation served on the tenant. This notice of deregulation and
related IAI reporting requirements are still applicable to 421-a (16) apartments.
GENERAL RULES FOR ALL IAIs
V. Proof of Installation and Payments Still Needed for any IAIs as part of an Overcharge Case or
Investigation
A. Acceptable forms of proof:
Claimed individual apartment improvements are required to be supported by adequate and specific documentation.
This documentation should be maintained in owners’ files and include:
1. Cancelled check(s) (front and back) contemporaneous with the completion of the work or proof of
electronic payment.
2. Invoice receipt marked “paid in full” contemporaneous with the completion of the work.
1
On June 14, 2019, the Housing Stability and Tenant Protection Act (HSTPA) changed IAI amortization rates from a permanent
increase based upon 1/40 of the eligible cost for buildings with 35 or fewer units and 1/60 of the eligible cost for buildings with
greater than 35 units to a temporary increase based upon 1/168 of the eligible cost for buildings with 35 or fewer units and 1/180 of
the eligible cost for buildings with greater than 35 units.
Revised (10/25) OB-2024-2 Page 4 of 8
3. Signed contract agreement.
4. Contractor’s affidavit indicating that the installation was completed and paid in full.
5. Before and after photographs.