N.Y. Comp. Codes R. & Regs. tit. 9, § 1627-5.2
(6) It is the policy of the division that tenants should be billed currently for surcharges.
(b) Vacated tenants.
Where a tenant has vacated, whether voluntarily or involuntarily, it is still the responsibility of the manager and counsel to locate such tenant and to collect all sums due the authority. In achieving this end, consideration should be given to utilizing the services of a credit bureau to locate a vacated tenant, ascertain his current employment and discover available assets, if any. Judgments should be secured, and garnishee placed if indicated.
(c) Write-offs of uncollectible accounts.
(3) Where all efforts as outlined above prove to be unsuccessful and account appears to be uncollectible, write-off should be handled as follows:
(iv) Accounts receivable in excess of $500 may be written off only after approval by the legal bureau of the division. Requests for such approval must be supported by the following:
(a) Tenants in occupancy.