Sometimes I'll tell them not to fix it (a punch hole in the wall) and I'm charging them for it.

I'm still figuring out how this site works, but I'll be in touch if I hit a wall!

Install low profile LED lights or wall sconces.If this is an investment property you need to be thinking about returns.

It's not fully closed as in drywall, it's sort of a faux wall on our side, but the tenant could open the door on his side and come through if he wanted.

did half the flip work, sold with new walls and new electric/plumbing.

Evan Hiller was quoted in the Wall Street Journal article about the Nightingale/Crowdstreet deal debacle:https://www.riggsdavie.com/team/evan-c-hiller

FHA does not allow you to do things outside of the home like adding a fence, hard scaping, retaining walls...   

Sounds like an easily executable deal from what you've stated but likely need more color to offer path forward, terms, etc.

Electric: is the easiest to split, but may require holes cut in walls to separate the units.Gas: gas lines aren't as flexible as wires, but it can usually be done affordably.Water: most cities will NOT install additional water meters on a property.

Glazing in walls, enclosures or fences containing or facing hot tubs, spas, whirlpools, saunas, steam rooms, bathtubs, showers and indoor or outdoor swimming pools where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface shall be considered to be a hazardous location.