Now, if you are purchasing a SFR this doesn't really mean anything as properties are not valued based on cap rate, but you many use it as a back of the napkin way to figure out whether you will cash flow the property.

You can do the math on a napkin and easily see these pencil out handsomely.rumor has it there’s a little old lady in this town who owns 800 houses .

It's a very simple, 'back of the napkin' tool.

It took me less that two hours to install the unit the first time.3: My unit is sealed with "Great Stuff" inside the wall for no air leaks around it and I found a nice thick cover for it to put on the exterior shell in the winter.For a lower end home a window unit is really the only solution if you are watching your bottom line and I feel they look too ugly to put in a window.Here are some photos of the very sanitary installation at this home.

@Brandon Rodriguez, one cocktail napkin analysis would be to ask how likely you are to get a 12% ($35K) discount on an already good deal of a $300K property (or the appropriate % for whatever size property you are selling) if you take your time right now.  

@J Scott, that's what I would expect.It still (almost) embarrasses me when I get all the information I need to do a conventional loan for someone,that same person will later ask me to recommend a Private Lender for a Rehab/Flip and only have a couple of sentences scribbled on a cocktail napkin to describe their Project, expecting 100% purchase and fix-up money by the weekend.

@Ryan KeenanHere's my napkin number crunching:$100,000 Purchase price $25,000 Down payment $75,000 loan amount (terms?)

Then you can hire an attorney to look it over and make sure it's 100% Kosher.It's important to remember that an agreement written on a cocktail napkin is legally binding but, because it's not written by an attorney, could be hard to enforce if it violates a law.

So the asking price seems to be inline with a back of the napkin calculation

I would guess the sanitary lines are at a higher elevation entering into the home and would likely have a hard time creating enough pressure to both sink down in the earth without running off and actually get under the floor or far enough down to be at the floor level of the basement.