(i) documented rents for comparable housing accommodations, whether or not subject to regulation pursuant to this Title, submitted by the owner, subject to rebuttal by the tenant; or
(ii) if the documentation set forth in paragraph (1) of this subdivision is not available or is inappropriate, data compiled by the DHCR, using sampling methods determined by the DHCR, for regulated housing accommodations; or
(iii) in the event that the information described in both paragraphs (1) and (2) of this subdivision is not available, the complaining tenant's rent reduced by the most recent guidelines adjustment.
(5) This subdivision shall also apply where the owner purchases the housing accommodations subsequent to such judicial or other sale.