In march, we signed a tenant to one of our higher-end long-term rentals. They were up front out of the gate, stating that they had just sold their house, and needed a place to live while they found their next home.
In that they wanted to sign a 3-month lease, with the option to go month-to-month after that, with a 45-day notice to end the lease.
I allowed them to proceed, but I asked for a 25% premium (about $1,000/mo extra), in exchange for the short-term lease, and flexibility.
Last night they notified me that they have found a house, and will be moving out on December 18th. This is far from an ideal date to end a lease, given house hard it can be to find a new tenant around the holidays, but it's what I agreed to, and I will have made an extra $9,000 or so in rent this year, so its not a big deal if I have to eat some extended vacancy.