(a) Individual Apartment Improvements. (1) Increase in space, new equipment, new furniture or furnishings; and other adjustments. (2) An owner is entitled to a temporary rent increase where there has been a reasonable and verifiable modification, other than an increase for which an adjustment may be claimed pursuant to subdivision (b) of this section, of dwelling space, installation of new equipment or improvements, or new furniture or furnishings, provided in or to the tenant's housing accommodation