Landlord Says I Have To Pay Past Length Of Lease

I signed a one year lease in September 2025 with two other roommates. We received a notice of nonrenewal in July of this year. I wanted to continue living there, so I contacted the property manager/landlord. He said I could renew the lease but I would need to apply again if I was wanting to live with other roommates. I have found one person who wanted to live with me, but I need two in order to afford the place.

I met with him today to do a walk-through inspection for the first lease (which will be ending August 31). I assumed since I have not signed a new lease, I would also be needing to move out if I don't find another roommate to sign a new year-long lease. He told me that I would still need to give him a 30-days notice, and he could prorate September's rent. He is expecting me to continue living past the lease terms, until September 17 (if I gave notice today) and pay for that. That is $2,000 and I cannot afford that. I thought since the lease I signed ends August 31, I would just have to make plans to move out before then. Is he able to enforce this?

I did not sign anything new. In the original lease, there is a month-to-month clause after lease term ends, but I thought his notice of nonrenewal meant that I would NOT be moving to month-to-month rent. What should I do? Would the notice of nonrenewal hold up/overrule the month-to-month clause in court? Any advice is appreciated.

Edit: The non renewal notice he sent says, “The current lease term expires on 08/31/2026. Possession of the premises must be surrendered, and all occupants, personal belongings, and vehicles must be removed no later than 11:59 p.m. on 08/31/2026, unless otherwise agreed to in writing.”

Location: Park City, Utah