Now, all the auto calculations. 

The next is ROI (I hope I did the right calculations). 

For results, RE cost seg (our partner for full transparency) built a calculator that allows folks to see conservative and then more aggressive estimates.

Airdna, Mashvisor, Awning, Rabbu, and AllTheRooms have calculators to help you estimate what you could make from a particular property. 

I have a question as I'm really struggling with calculating the BRRRRs. 

Don't rush, think it through and make calculated decisions with applied faith!

Will have to develop a new layout and have the engineer re-calculate the storm pond size and demand. 

So let’s say you are looking at a duplex (2 unit) as long as the rents total per month from the ( 2units) are equal to or greater than the PITI payment its approved.The way you shop for the home is by sale price and using the loan amount after down payment as your calculation.

I mean - you can, but you will still have to include the semester-long rentals when calculating your average annual stay, and it will break the 7-day rule.

Back in the day we carried a balance of $100,000+ that was owed to us and that is now down to only $10,000 or so and we only cover out of pocket if it's an emergency.The PM must have sufficient reserves to do the necessary maintenance work and shouldn't be chasing landlords for money.Just my opinion...Also, a PM's number 1 profit center is maintenance up charge.Landlords don't have much insight and PM's nickel and dime to death on those.If you are suspicious, ask for a receipt so they aren't making up non existent maintenance.Let them make their money tho and calculate that into your expense pro-forma.Otherwise, manage yourself and deal with the $#%^@ that comes with it lol.Multifamily in Ohio, you can get for $25,000 - $35,000 a unit.Drop another $5,000 - $10,000 into the turns and rents should be North of $800pm.Decent area's also.Personally, I wouldn't get out of bed unless I'm making the above numbers.Wishing you much success