Quote from @Mackaylee Beach: Vinyl flooring is my top choice for achieving a clean, modern look at a lower cost.Its versatility and durability make it an ideal option for various rooms, from kitchens and bathrooms to living areas and bedrooms.

The templates are bland and don't feel modern.

Modern, nice, and it's NOT cheap. 

Maybe they own the house behind it and want to put up a garage or driveway access to their backyard.   

If that doesn't work you'll want carpet or concrete apoxy (like a garage).

But that’s going to be toilets, faucets, leaks, garage doors, etc etc. 

A small amount of movement in the rail of a screw-drive garage door opener can be normal, as it’s designed with some flexibility to handle the door's movement.

But my 4 renters are in there 30's-50's and work 50+ hours / week building naval ships and submarines and they enjoy being close enough to walk to the shipyard and coming home to a brand new house with all the modern upgrades. 

Rent would be ~$4500 for the new tenants and the ADU could go for $2-3k if we converted the garage. 

They advised making sure that the drain in front of the garage be kept clear which we did religiously.