(ii) subject to subparagraphs (iii), (iv), (v), (vi), (vii), (viii) and (ix) of this paragraph, the rental history of the housing accommodation prior to the four-year period preceding the filing of a complaint pursuant to this section, and section 2522.3 of this Title, shall not be examined; and examination of a rent registration for any year commencing prior to the base date, as defined in section 2520.6(f) of this Title, whether filed before or after such base date shall be precluded;
(iii) except in the case of decontrol pursuant to section 2520.11(r) or (s) of this Title, nothing contained in this section shall limit a determination as to whether a housing accommodation is subject to the RSL and this code, nor shall there be a limit on the continuing eligibility of an owner to collect rent increases pursuant to section 2522.4 of this Title, which may have been subject to deferred implementation, pursuant to section 2522.4(a)(8) of this Title in order to protect tenants from excessive rent increases;
(iv) in a proceeding pursuant to this section the rental history of the housing accommodation pre-dating the base date may be examined for the limited purpose of determining whether a fraudulent scheme to destabilize the housing accommodation or a rental practice proscribed under section 2525.3(b), (c) or (d) of this Title rendered unreliable the rent on the base date;
(v) an order issued pursuant to section 2523.4(a) of this Title remaining in effect within four years of the filing of a complaint pursuant to this section may be used to determine an overcharge or award an overcharge or calculate an award of the amount of an overcharge;