You also will not get full value for the SF associated with the bath remodel. 

seller approached my partner wanting to sell an outdated car repair shop. we negotiated the deal from $170,000 to $120,000 being as we needed to put in some serious remodeling.

If you go forward, make sure they handle all maintenance & repairs on the property too because these organizations typically have in-house staff..Snaking toilets, repairs, grass cut, snow removal, paint...Make sure you're covered with insurance as well. 

Because in reality, by not hiring a property manager, and committing to doing the easier things myself--like unclogging a toilet / shower drain, fixing a light bulb, pest control, calling a plumber--I am committing to be on standby for many hours, which is a sacrifice of peace of mind / being able to leave town or take vacations--and I would like to know if it's worth it. 

Ultimately we decided to completely replace and revamp both the entire carwash tunnel equipment and also completely remodel the customer lobby are. reversed the staircase to allow for a separate entrance to access the upstairs office space to rent out separate from the washWhat was the outcome?

I am a remodeling contractor and have a long time friend/acquaintance with significant resources and capital.

Doing a remodel on a 750sqft unit and am curious on what people use to haul the demo away?

Storm sewer not the one connected to the toilet.

Other than price, what seller-funded incentives are working to move a remodeled single-family home?  

So now we have conditioned when a person leverages self to the gill's, taken on mountains of debt and the grand some of there career is waiting tables or making coffee and some toilet-paper degree that a bajillion others also have, and maybe a few years experience at best.