Includes a detached 4-car garage, handicap accessibility, security intercoms, a new 2019 roof, energy-efficient windows, and a suppression system land to develop.

They may hire a contractor (they use the same guy and he's done a great job so far) or a specialized trade for anything more advanced - electrical, plumbing etc. 

Also, electrical can be a challenge depending on the layout.

Counteroffer could be something like 10k up front and 200 a month for 5 years would give you a buildable lot with water and electric for 22,000.

I got hit with a 14k water bill, and 8.5k electric bill on remote meters that weren’t working.

Plumbing, Electrical, Gas,.

If there were laws about Chrysanthemums, I'd follow those too...especially if they kept causing electrical issues (and therefor safety issues) in the house!  

Its not just a matter of rearranging dividing walls plumbing and electrical.  

The day I purchased the property I let everybody know via notice that I would be fixing any problems that they may have such as plumbing, electric, whatever.

I find RE syndications to be a very good blend, between managing RE and passive REITs, they keep me locked up for 10+years minimum, so I don't (as a glorified Chimp with Wi-Fi) trade out of them at the wrong time when market gets scary, but they also generate REIT beating returns and as an LP in 35-36 deals I have no active role, so I can focus energy/time at my job, creating more investment income, and the tax benefits are beyond sexy.