The provisions of such rental agreement may not be modified by the owner except with respect to the amount of annual rent. The total increase in rent for any one year during the period of notice shall not exceed an amount equal to the sum which would result by multiplying said rent by the percentage increase in the consumer price index for all urban consumers as published by the United States Department of Labor, Bureau of Labor Statistics, during the calendar year immediately preceding the date of receipt of the notice of intent to convert, or ten percent, whichever is less; provided, however, nothing herein shall limit the right of an owner to any amounts which may be due under a valid tax escalation clause, provided such tax escalation clause was included within the rental agreement existing as of the date of the notice of intent to convert. The review board shall be notified of any rent increase on a form provided by the review board.
(h)
Renovation to units during the notice period. Tenants are entitled to freedom from unreasonable disruption as a result of rehabilitation, repairs or improvements. The owner may only make repairs in a tenanted unit undergoing conversion that are required by the State Sanitary or Building Codes. Other unit renovations or improvements may only be undertaken with the express written consent of the tenant. In the event that the owner wishes to make optional upgrades to vacant units or common areas, the owner must comply with review board rules and policies regarding such repairs or renovations including, but not limited to, days and times repairs can be made, methods for notifying tenants in advance of the work schedule, rules regarding any interruption of services and clean up procedures.
(i)