Monarch Investment and Management recently bought ...

Monarch Investment and Management recently bought the apartment complex I have lived in since 2015, The Villages At General Grant. Yesterday, May 4, I was given a letter stating that if I sign a new lease by May 15 (in eleven days), my rent increase would be just 15$. If I sign by May 31, it would be 20$. And, if I wait until after May 31, "renewal rates are subject to additional increase." It doesn't specify how much. Also, my lease doesn't end until July 16. I feel this is unfair and unethical. I feel pressured into staying here. I understand rent goes up, but why is it tiered like this? Why can't it just be a set amount and we all move on from there? I have really enjoyed my time here and don't want to move, however I just don't think I can rent from a shady company. I have been a renter for eleven years and I have never seen this before. I suggest everyone stay away from Monarch owned properties.