I wanted to know that if I had signed a lease with a friend and the landlord's added changes such as, tax increase of 12% and additional late payment fees, is it mandatory that all people who are on the lease (me and friend) to agree and sign for it together, or can just one person (my friend) sign for it without telling me anything? Also, when such changes are made, does that make the lease that I originally signed still active? I know that both parties need to agree on any changes(landlord and tenant), but I'm confused about if these parties also includes me. In my case, I felt left out not knowing about the changes and that I should have some control over the lease too.