You can also expect the buyer to sue you for specific performance (court order to complete the sale) along with any damages like alternative housing, storage of his household goods, additional moving costs, etc.Unless there's something you're not telling us, it sounds like the broker did his job and got you an offer you accepted. 

So do you think this is an anomaly, or do you think self-storage is poised to rise across the board in the coming months?

I've found old garages are more of a liability than a good investment in the lower rent areas unless you get lucky and get one that isn't falling over - it will cost more to bring them back to life or replace them than it will ever bring back in rent and therefore, the best choice is to remove them and spend the money on a new parking slab - obviously a property that already has that done is a plus (people use them as storage lockers too, then leave it all for you to clean when they skip out later).

@James York my partner and I look for self storage in the Charlotte market and beyond.

Moving trucks and self storage are the best investments here for the next two years.

Additionally, when you look back at the hopefully deeper recession in 2009/10, multifamily was the top performing asset class (maybe self storage, but that was not a widely recognized investment class at the time, per my research). 

@James YorkHi James, I have a duplex in which I give the tenants use of a shared storage shed.

The only metal building deals I've done were self storage, and it's been quite a while.

Proof of any additional income such as laundry, parking, storage, etc.

***All of these statements and recommendations are based on experience, research, and opinions of Courtney Buck and not of the U.S Government I agree multifamily is the best space to be in other than storage and mobile home parks.