It appears your question possibly concerns lease alterations and landlord retaliatory actions.

Under Colorado law, lease agreements are binding contracts, and any modification typically requires mutual agreement between the landlord and tenant. Specifically, C.R.S. 4-2.5-208 states that a landlord cannot change a lease's terms if the existing lease requires a record or signature to modify or rescind it. Furthermore, C.R.S. 38-12-213 prohibits landlords from requiring tenants to sign a new lease or agreement in violation of the existing lease terms.

Landlords are also prohibited from retaliating against tenants. Colorado law has a broad definition of retaliatory action. For instance, retaliation can include unjustified rent hikes, selective rule enforcement, and issuing excessive fees. It can also come in the form of altering a lease's terms or refusing to renew it altogether without a legitimate reason.

In Colorado, tenants have legal recourse if their landlord engages in retaliatory actions against them, including recovering monetary damages. I recommend speaking with a landlord-tenant attorney to evaluate your specific circumstances and determine the best course of action.