(5) the increase in the legal regulated rent for the affected housing accommodation shall be one-one hundred forty-fourth, in the case of a building with thirty-five or fewer housing accommodations or one-one hundred fifty-sixth in the case of a building with more than thirty-five housing accommodations where such increase takes effect on or after the effective date of this chapter, of the total actual cost incurred by the landlord up to fifty thousand dollars in providing such reasonable and verifiable modification or increase in dwelling space, furniture, furnishings, or equipment, including the cost of installation but excluding finance charges and any costs that exceed reasonable costs established by rules and regulations promulgated by the division of housing and community renewal;
(6) costs shall only be recoverable by a landlord pursuant to this subparagraph for an individual apartment improvement if, immediately prior to undertaking such individual apartment improvement, the landlord submits to the division of housing and community renewal any evidence that the division of housing and community renewal deems necessary and requests pursuant to regulation, operational bulletin or other guidance, demonstrating that the improvement was necessitated by a sub-standard condition or exceeding its useful life immediately prior to the landlord's work to improve the unit and the landlord's planned work to improve the unit. Such evidence shall include, but shall not be limited to, photos of any areas, aspects or appliances in the apartment that will be improved, and any necessary permits required to undertake the improvements;