In 2024, we are upgrading the outdoor space to include a putting green, a nice firepit situation, a playset, and expanding the deck.

Where I live everything is about outdoor spaces, outdoor living etc, its all the rage right now, not sure if its the same in your area though, so take my suggestions with a grain of salt.Looking forward to following your progress, thanks for doing this, its very cool of you and your partner to share your time and experience.

They also have us to around 3000 sq/ft of lawn or outdoor space. 

ADU's cannot be rented short term.. and if you have the option to provide some outdoor/patio space it'll be even easier to rent out.  

Your outdoor unit will also last longer because you're only using it half the time.

@Nancy BachetyWe have one we use for our vacation cabins who covers the outdoor pool and other potential liabilities.

Yards and the exterior we require, for example, yard maintenance at a minimum every 2 weeks, with no "indoor" furniture allowed outdoors including on porches, and no stored items, no car parts, construction materials, or vehicles that are not currently licensed and operable.You can also require annual professional carpet cleaning in the terms of your Rental Agreement.

The sheltering need not be clandestine, and harboring covers aliens arrested outdoors, as well as in a building.

But you can certainly mandate the use to be outdoors, and I would require a separate deposit for potential odor removal.

He may even be able to eek out a little more rent on the 2/1 units, since they are newly renovated, with popular style/design and depending on the outdoor space and onsite parking available.