On page 117 of Brandon Turner's "The Book on Rental Property Investing" he has a chart to calculate capex and I did my best to recreate this with more accurate prices (in the book he only budgets $5000 to replace a roof).

Can't really see the metal wall from my house but you can see the roof to the commercial building as you're driving in and in the winter the trees provide less cover - although there is a very high and nice privacy fence to separate. 

@Karolina PowellA lot of people have mentioned different aspects of this in their posts.

new roof and updated interior of one unit What was the outcome?

new roof and updated interior of one unit What was the outcome?

But there is a lot of missing info that makes it hard to even begin.As other's noted, it could be any number of things, some more common than others.It might not even be bathroom related, i.e. a roof leak that is showing itself in a bathroom (but presumably this would be present when raining and shortly thereafter).Toilet, could be wax ring or the O ring that connects tank to bowl.  

Thank you Ned, that is exactly right, we actually check a condo/townhouse about 2 weeks ago, the thing was a condo with a basement, I cannot tell if it was a condo or townhome, anyway, the ceiling in the first floor was bowing, the 2nd floor, one of the bedroom was sinking, could not tell how this damage was done but the walls came apart from the floor, you could see the roof of the unit bowing inwards towards the structure a bit, and their "general contractor" estimate that for 5k they could straighten the property and level everything, even 1 window and 1 door looked so uneven that you would think  there was something wrong with your eyes...5k for structural damage, good luck with that one, we ran as far as we could from that....but we have seen they do inflate their ARV, since we learned the hard way , we go through these deals with a magnifying glass, I knew I was not so picky, numbers do not lie.Another thing that caught my attention, which I do not know if I am overly suspicious now that I am older, but they want to get the closing for us at the same time/day they are getting the property from whoever they buying it, which it seems to me they try to save on the closing by having a "dual" closing when in reality is just 1 closing and we are the one paying for it...I do not know there are few things that do not click right with this folks.

Some people dont even intend to get that many however if you are trying to maximize 10 from each partner/person then you'd try to qualify and hold title separate for your own 10 prperties (10 + 10 = 20 total properties).You can also look at credit aspects as well but typically lenders will use the lowest of the 2 middle scores (3 scores per person but will use the middle score).So the most important aspects are the income to qualify for the loans in the case of full documentation loans.

They don’t sell off their mortgages so I will always have a local connection in case I need assistance with the loan or any other aspect of my business.

When purchasing, things that will amplify rates are roofs that have less than 10 years life, old water heaters, flood zones etc.