@Gabe N. between the late payments, extra dog and total disregard for sanitary living conditions, there is no hope here.

We usually estimate 100 a month in taxes and 100 a month in insurance for a typical back of the napkin analysis on a SFR asset, but that’s not necessarily true in your area, and if the house was purchased for $65k.... well, I hear you.

The sanitary system needs to be filled all the way to the top fixture with water and let sit for 24 hours and inspected again.

Sometimes though a basic engineering calc is required in terms of post/beam sizing.Because I'm an engineer lately I've just been drafting plans and I have been given more flexibility in how I handle managing the work (ie: hiring someone, doing myself, etc).If you message me I'd be happy to look/think a little bit more about this for ya, to throw some back of the napkin numbers at materials/labor and then even possibly estimate time investment to get through this part of the project.  

So if you're putting $125K-$200K into a large home it still means you have to basically be given the house for free for any back-of-the-napkin math to make sense. 

Or you can write one up with a crayon on a napkin.

My napkin math of CoC came out lower than his 12%; if I set aside about $200/mo for CapEx, that lowers the annualized cash flow from $8773 down to $6373, which puts the CoC at 8.7%. 

looks like it passes a solid napkin test @Pascual Torres  .

The full bathroom (sink, shower, and toilet--obviously) passes through the grinder apparatus before being discharged/pumped up towards grade and into the city's sanitary sewer line (Baltimore City utility).Not sure what the additional risk/liability/maintenance costs (etc.) are that I should be taking into account. 

So I use a back of the napkin type overview analysis to weed out obvious no deals.