Whenever I hear anyone talk about managing occupancy, there is always a heavy focus on leasing.

I have a tenant who lives in my very nice three bedroom unit whose lease provides a pet authorization for “one dog, one cat and one rabbit.”

All things being equal, a simpler option would be to terminate the lease with a penalty of one month's rent, agreed to in writing.

I suggest your next lease have such a clause and that you make sure you can find the lease (but i have also somehow lost a lease recently).For where you are now, without a signed copy of lease i believe your options are limited.  

As the new owner, you’ll want the lease and your landlord insurance policy to take effect as soon as you take title to the property.Temporary Lease Considerations:While short-term leases can work well, leasing to a seller long-term often leads to complications.

You would need to notify them in writing that you will not be expending their lease and they will not be transitioning to a month-to-month lease. 

And if you want to release her from the lease I’d just do it.

Id let them out of the lease or evict.

The current tenant was already in place when I purchased the building, and their lease is set to expire in a few months.

Can you lease an apt under USDA low income and have someone else live there???