I completely renovated the bathroom in my house for around $6K, all new everything including flooring, plumbing, fixtures, tile, drywall, lighting.  

You have to tread lightly there.

Security system, lights, fencing off the property during rehab, talking with neighbors to keep an eye out, etc.

and at the end of the day, we need to be able to use common sense in getting into a door.Yes, you will need a WiFi set up to control the lock at your location and a very cheap subscription if you want to control the locks remotely - but you don't have to.Beware of shiny, good "Apple" design looking products made of cheap and light plastics, especially when it comes to longevity and the heavy mechanics needed to withstand millions of physical movements and human force.Also, remember the water- and weatherproof factor.The "on top of door deadbolt" solutions are NOT preferable over the inside lock solution.

My 150 year old brownstone I allocate $2500/yr for maintenance which is likely a little light, a newer place I'd say $400-500/unit.

Unbelievable factory like results, with a gorgeous sheen, and way less trouble than my old method.It only takes a tiny bit of effort to get even coverage with the clear, i had to get the lighting at an angle to effectively see the wet edge of the clear going on.

Once you reach the larger buildings, you normally have on-site maintenance staff that handle light switches, toilets, etc. 

Can someone please shed some light that has experience in Massachusetts preferably Fall River as each town might have different laws.

medium/Light rehab with lots of sweat equity What was the outcome?

Light rail and the work from home crowd is definitely spurring things as well.