Riverstone and Brookstone Apartments ripoff changed lease before lease was completed Covina California

The apartment complex I reside at has been sold and the best part is they changed the lease agreement before the lease due date. on top of that they added a set of new charges which include now to pay for water, trash and sewer costs to a non utility based company. now I do not see how it is legal to change your rental agreement this a legal binding contract and also to see double standards in the apartment community. I have all documentation that has been given to me and most of it contradicts itself. also i understand that a home owner has to pay for trash removal from BFI/Allied waste or a possible other candidate. but i do not see how a corporation puts the bill for trash removal on a renter.this also bothers me that certain residents have dogs in an apartment complex that states no pets allowed(dogs and cats) in writting in the lease agreement. I am so angry at the double standards the landlord/owners practice and I would greatly ask for any insight to what legal steps if any i could take to justify my rights as a tax paying citizen who also served in the army for desert storm

Warren
Covina, California
U.S.A.