I have done FSBO on a few homes, but recently put a remodeled DW MH on 1/4 acre up as a FSBO at $79,900 (which would include a new metal roof for full price offer) and 3% broker protected on a sale. 

The house while old is in nice condition and has quite a bit of new components (roof, boiler, hot water tank) and should make for a great rental so be we do a good job of screening tenants.By no means am I saying it is A or B class renting and the tenants are top notch citizens but it is not at the other end of the spectrum that some are imposing is all doom and gloom.

My hope would be to transform it into a 4 story, each of the 4 units having 2 Beds & 2 Baths & a common access to a roof deck area. 

The reason being is that the estimates are based on everything from the physical location of the house to what kind of siding is on the house.I can tell you that for my 920 SF 2/1 with vinyl siding, not in a flood zone, with a 9 year old roof.

If the water heater has  3-5 years left on it, estimate that replacement cost in 3-5 years, same with roof, furnace etc.

3 - How many times will you have to replace floors, kitchens, furnaces, HWH, driveways, porches, paint, bathrooms, roofs, etc...over those 10, 15, 30 year periods?...

Meaning, you complete a line item repair (new kitchen, roof etc.), pay the contractor, then get reimbursed by the HM lender.

I have been a property manager for 15+ years as well as know all trades (roofing, minor plumbing, minor electric, drywall, paint, carpentry) from my years of working on homes.

It was built in the early 90‘s , its been maintained decentlyWill require a new roof in a couple of years Drainage issue under the home , will cost roughly $2500 to correct It was rented for a short time 3 months ago for a period of 3 months.

It will increase the perceived value and the appeal of the building to a new owner...it is nice to know there are new pipes, so it might make them more comfortable buying your building.... but because it is an unseen it will not exactly increase the actual value nearly as much as something like a new roof that they know there is a limited lifetime on,  and much less than a new kitchen would increase.Most owners never consider the fact that they will ever have to replace all the pipes so in their mind you are not saving them any money and certainly not making them any money....so it doesn't change the math.