However, in the absence of collusion or any relationship between an owner and any prior owner, where such owner purchases the housing accommodations upon a judicial sale, or such other sale effected in connection with, or to resolve, in whole or in part, a bankruptcy proceeding, mortgage foreclosure action or other judicial proceeding, and no records sufficient to establish the legal regulated rent were made available to such purchaser, such orders shall establish the legal regulated rent on the date of the inception of the complaining tenant's tenancy, or the date four years prior to the date of the filing of an overcharge complaint pursuant to this section, whichever is most recent, based on either:
This subdivision shall also apply where the owner purchases the housing accommodations subsequent to such judicial or other sale.
N.Y. Comp. Codes R. & Regs. Tit. 9 § 2526.1