There is a 90% chance the problem was caused by a running toilet. 

I'm glad to help with info, or potential rental estimates for properties you're thinking about on the STR side.

I also review the insurance costs and try to get a solid estimate of coverage expenses to fine-tune my calculations.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

It has sat empty for the last 20 years but the current owners have completely gutted it, have bids from contractors they're willing to share, cost estimates etc. and have had lots of inspections done and so much pre-work with the city and county to figure out what they can and can't do, so a solid plan is already in place.

Buying and selling MF on your own going to be pretty tough this gets you going and if by chance you like it and can start to represent buyers and sellers you will make some pretty nice commissions..

Not calculating maintenance expense could end up being a nightmare.I always estimate (using either the 50%, 1% or square footage rule) the annual maintenance / first year of maintenance fees for a ALL rental property.

This would increase my chances of being approved for a FHA loan.

I typically look at Zillow, centimeter and BP to get a full understanding of what rents are in the area to get the best estimate of what a property would rent for.