I am in the Indianapolis market so it may be different, but we charge 18% and thats pretty standard.

Someone who is willing to seller finance may be willing to offer terms  for a low down payment option but that will come down to negotiations since there are no standard rules for seller financing. 

I know it depends upon where we are located but I was hoping to put some numbers in my analysis.For instance, I have assumed that it will cost me $1,000 to add each meter plus any required internal plumbing/wiring to get everything run correctly.

Ive taken over standard mortgage companies before sub to. 

Standard homeowner type mortgages are common.  

I like these amongst ,many other right nowREXR - (Rexford) they are a niche (sub-specialist) in industrial warehouse/distribution/manufacturing in the southern California only urban or Infil area, they are not international like PLD - prologis, their MOAT is that SO-Cal has geographic limitation to new inventory, so they have rent pricing power that industrial in rest of country doesn't, also 26 million people in so-Cal and the 2 busiest Ports in country, their earning/revenue projections next few years are best in class, and they are cheaper on price to book than PLD or others, I own some and will buy a lot more in upcoming Recession, likely in next 6-12 months, when publicly traded equities will likely slide by 20-30% although their assets (physical buildings) are only going up in valueVICI- (casino REIT), used to be part of Cesars palace, then Caesars spun them out in 2018, to do sale leasebacks of their properties to take all that physical capex off the books.

This does not seem standard to me, and maybe illegal?

Sorry to hear this.I would always say that "There is nothing wrong with any property as long as the price is right".Granted, some are not salvageable and the deal doesn't make sense even if the seller paid to me to take it lolOver the past 10 years I have witnessed many investors trying to do the same thing as you.Purchase from afar without buying turnkey and trying to do it themselves.This has been popular especially the last few years.Not many succeed unfortunately or they don't succeed in my eyes as they are into deals for much more than what they should be.There is a big trend going on where folks are made to "feel involved" with the purchase, rehab and property management process.The properties look great and off-course they do as rehabs cost $40,000 - $50,000.It doesn't sound like a lot of money for folks from CA and NY but for our local standards it is and IMO kills the cashflow and is unnecessary overcapitalization.Each to their own I guess.Just had a call the other week with a fellow from CA that bought a few turd properties from a local scam artist and is flying to town to try and rehab them himself.Another fella I managed to save even tho he lost his deposit of $1,000 as the seller (Another known scam artist) made him commit to the deal without allowing an inspection or even a walkthrough...If that isn't a red flag then I don't know what is 🤷‍♂️Hat's off to you for flying into to town to see the property for yourself.Wishing you much success

We go down to a 75k value/purchase price for example and some of the same tests that a loan this size may fail for a standard mortgage would not be an issue. 

Is there any standard paperwork I need to sign with a troublesome tenant who, after long negotiations, moved out on time?