Most flippers will only add the ADU if there is already under utilized living space (not garage conversions but craft rooms, bunk house, etc) to convert.  

This completed project adds value to the Morganton rental market with its modern updates and versatile use.

Situated in the heart of the city's vibrant Art District, this 1977-built condo offers an exceptional blend of historical charm and modern living.

Once updated, the building will provide modernized living spaces and support a significant rent increase, enhancing cash flow and property value.

I rent homes unfinished for the most part but sometimes, if a space would look better with something extra, like a coffee bar or a patio table, I will pick one up.

Quote from @Marc Shin: Look underneath it (crawl space, basement).

The dishwasher should be to the right of the sink as a large majority of people are right handed.There is a picture of a second fridge in the kitchen, but no mention of it in the listing.You'd have been better off putting the stove where the second fridge is and giving the renter more countertop space. 

I'm in the messy middle as a residential agent who works mostly with investors and specializes in the small MF space.  

Does their collective business occupy one of the spaces in the building? 

To gain equity with MFH, I'd recommend doing modern renovations in the kitchen and bathrooms (like you said).