I'm wondering what lease clauses people are using for like remote-workers wanting their own office, or artists renting an apartment but not living there, or an online shop that just needs space for storage and a computer.

I will add we took out a loan to buy the home for 20k along with extra cash to put into our home to make a "home office" out of the attached garage we never used except for storage so we added even more value to our 156k purchase.

If I'm in your shoes, I would keep tabs on comparable sales in my areas (I believe Zillow lets you setup alerts for sales in your target areas) and use those as your best measuring stick for figuring out your own value. 

Some thoughts - garages or carports, for extra income from tenantsIf you have the ability to add a second driveway, consider trailer / boat / rv storage in an area enclosed by a privacy fence, or even garages to be rented to non-tenants for cars / storage.

Ideally, I'd like to buy a more practical car for managing my rental (something with more storag space) later this year. 

Their investments were apartment complexes, self storage, car washes real estate debt funds where you could choose which fund you wanted to invest in. 

Hot water heater leaked and flooded downstairs storage area.

Talk to zoning about possible simple storage structure.  

Pack up all your stuff in pods/self storage/whatever.

But each year the IRS has continued to shoe their dislike and distrust of the arrangement.