PM me the property- I can check what traded nearby. 

Nowadays its SOOOO much worse.Or find a rehab & work on it weekends. ... but make sure you are aware that everything costs more now including all licensed trades like plumbing & roofing etc.BUT dont do it just for money.

Anyone can break it without many consequences except for eviction record on your name

It might stop the bleeding for a bit but it could lead to worse consequences down the road, I'd advise sitting with a CPA/tax advisor with all information and finding a strategy that fits your goals. 

I'm also finding that trades are declining smaller priced jobs which take away the opportunity for higher priced ones; in this case, let them know that you have multiple properties so a small job today is worth doing for future business from you.I never thought I would have to offer this but please don't do what a former client of mine did and hire drug addicts to do the work (and that's why they are now a former client); it pays to have the job done right while affiliating yourself with people who don't make you look over your shoulder after they leave. 

The biggest observation I have is so many folks use single family to trade into multi.

Maybe they really want to move into a SFH and they need a larger deposit to do so, you could trade some cash for those keys in that manner....You also mentioned that the rent was below market, if they are on a month to month lease, then you should be able to start systematically raising rent to bring them up to market. 

It is my belief that the $700/month average SFH YOY rent increase is in part a consequence of the extreme covid eviction moratorium.  

If you go new you would be trading equity for time and work spent I guess. 

Anyway, the best way to find a buyer for a vacant parcel is to put it on the MLS, so we "whole-taled" the ones we've done, meaning we closed ourselves with our own money on the vacant lots at what we knew were a decent price, i.e. 1/3 or 1/4 of what the vacant lots around it were trading for, and then we immediately put it on the market, however in an intelligent and professional way, meaning we knew the exact details of the zoning (most listing agents are too lazy to figure that out), utility availability, drone/aerial photographs, etc.