Purchase Price: $435kLease Rent for main unit: $1,500/mo ($750/room + myself living in one room)AirBnB Rent: Target of $2,200/moMonthly Payment: $2,500 (after utilities, water, internet) What made you interested in investing in this type of deal?

My response is fair in that regard.My point is, paying for legal and tax entity planning gets you a far different answer than general, high-level nonchalant "water cooler" advice.A doctor may diagnose something vastly different after running tests and scans than he/she initially did just talking to you and hearing your symptoms. 

We also remodel all the rooms with water proof rigid core flooring, install kitchenettes with 110 electric cooktops, range hoods, and a mini fridge.

No hot water.

HVAC air filter, fridge water filter, etc).  

There is a way in Buildium to create statements for the tenants but we are wanting to do a breakdown of water and sewer fees. 

Each month, we have tremendous Contractual Obligations and payments to make - Grocery-Bills, Utilities, Mortgages, Plumbers, Electricians, Medical Insurance Premiums, Property-Insurance, Sewer-Water, Oil, Gas, Electricity, Property Taxes, Cable & Internet, Cell-Phone, Income-Taxes...Are we now doing away with our entire system of Contract & Tort Law?   

A story I tell sometimes: years ago one of our local utilities had their water main wash away in a hurricane.

Would you pay mortgage, insurance, and water through the business account, then personal expenses like electric and cable through your personal account?

Being a newbie, I may have some numbers that are a bit off, and if so, feel free to challenge them.So I have seen people assuming Capex of 5-10% of the rent, which would equate to $85-170/mo for a 1,500 sqft 4br/2ba with no garage.When I run the numbers though, I get: $328mo, or just over19%, so I wanted a sanity check.I calculated the following (installed costs):Water heater- $1,000 per 10 years =$8.3/moDoors(8int)- $2,400 per 25 years =$8/moCabinets- $5,000 per 20 years =$20.8/moCounters (gr)- $4,000 per 25 years =$13.3/moBacksplash- $2,000 per 25 years=$6.7/moFridge- $700 per 20 years=$2.9/moOven- $500 per 20 years =$2.1/moMicrowave- $300 per 15 years = $1/moDishwasher- $400 per 15 years =$2.2/moGarbage Disp- $200 per 10 years=$1.7/moWasher- $400 per 15 years=$2.2/moDryer- $400 per 15 years=$2.2/moSiding- $12,000 per 25 years=$40/moA/C- $5,000 per 15 years=$27.8/moDoor(Fr)- $2,000 per 30 years=$5.6/moDoor(Back)- $750 per 30 years=$2.1/moRoof- $7,500 per 20 years=$31.3/moTile (500ft2)- $6,000 per 20 years=$25/moLVP(1000ft2)- $5,000 per 10 years=$41.7/moPaint (int)- $4,500 per 5 years=$75/moGutters (200ft)-$2,000 per 20 years=$8.3/moI would probably need some $ for driveway, exterior paint and landscaping as well, but overall with what I have included, it seems 2-4x more then most people even budget for.