(about 215k)-Unlisted Sale Price: 600k (buyer pays all closing costs)-Outstanding Loan: 175k (Seller A has been paying this alone since the inheritance, about Aug '22)-Current Mortgage: 1650/Month (with PITI) on a Variable Rate product through Fargo-Home needs rehab estimating 75k-Current Comps show an estimates value after repair of $800k, conservatively. 

Often, there are self-employed loans that will require only a 10% down payment, but as with all lending, his terms will most likely improve with the greater down payment he is willing to make.In short, your friends' situation is very possible to get great financing for, but it's probably the most "complex" type of scenario to give immediate quotes for, as there are so many variables that depend on what actually shows up on his documentation.

Depending on the criteria you set, like your expected COC, ROI, rent to value, etc. it will tell you the max you can offer and details out everything from the purchases costs to holding costs to cash flow to your max allowable offer given the variables you put in.

Nice analysis.I'm super conservative...so my numbers probably more conservative than yours.I think your tax estimate is low.....I think I'd be using 2.5 as average.I think your vacancy rate is low.....I think I would use 7-8%....just talking with another investor tonight about vacancy on single family...of course lots of variables...but when I first started, seemed like tenants moved every year, then 30-60 days vacant a year. 

You look at far more deals than I do, but the few I've seen tend to stress test individual variables, which, at least to me, ignores reality.

Right now I am seeing ranges from 3.5% variable rate and 3% closing costs to 5% and no closing costs.

It depends on a lot of variables.

(Internal Rate of Return)It’s fairly useful as it allows you to factor in the time value of money(money is worth more today than a year from now).It is a formula which is cumbersome to calculate by hand, but input (XIRR+assumed and known variables referring to your investment) into excel and it can help you evaluate a real estate investment.

With respect to the RV park itself, there are a lot of variables so it's not appropriate to use a blanket formula to establish value. 

It almost forces you to understand all the numbers; you get to see how each variable affects the calculations and the overall final numbers.