Deed restriction period: All affordable units shall be deed restricted for a period of 30 years from the date of the initial occupancy of each affordable unit (the "deed-restriction period"). The affordability controls shall expire at the end of 30 years after the date of the initial occupancy of the respective individual affordable unit, except, as to rental units, the affordability controls shall remain in effect until the date on which a rental unit shall become vacant, provided that the occupant household continues to earn a gross annual income of less than 80% of the applicable median income. See N.J.A.C. 5:80-26.11(b). If, at any time after the end of 30 years after the date of initial occupancy, a rental household's income is found to exceed 80% of the regional median income, the rental rate restriction shall expire at the later of either the next scheduled lease renewal or 60 days. Ibid. For for-sale units, the deed restriction shall expire only after it is properly released by the Borough and/or the Borough's administrative agent.