So this is saying that you are "agreeing" to the full price, allowing them to one day charge you that full price?
(While hooking you in with the 50% discount?)
they can't just arbitrarily jack up the rent during the term of the lease. but they might when you try to renew the lease, or when you move out. the effect is as if there is no rent stabilization (unless market rents go up above $4000 a month or whatever the "official" number is.)