A landlord cannot change an existing lease agreement without the tenant's consent. What your landlord can do is make changes to future lease agreements. Any new tenant would then be subject to the new terms, and when your lease expires you are subject to the new terms if you decide to renew.

Can new management change lease agreement?

We do not provide new leases as state law is very clear that the management company or owner listed on the lease can be changed by proper notice and does not change or modify the terms and conditions of the lease. A slip of paper at the door may not satisfy your state mandatory requirement for proper notice.