Did you run a cash flow model to determine what kind of returns it will generate over time, using your assumptions for raising rental rates?

A lot of assumptions.  

But if you are going into larger multifamily you would want to get your property manager involved and have them confirm your rent and expense assumptions as they should have a good pulse on the market for these numbers.

The price is only as good as you can actually verify the assumptions.

Study the proforma, and understand the assumptions before making your final decision. 

I am having trouble running a report on this property as I do not know what assumption I should put in (for vacancy and maintenance) and I only have experience with multi family buildings. 

I am having trouble running a report on this property as I do not know what assumption I should put in (for vacancy and maintenance) and I only have experience with multi family buildings.

What age/condition will they be in 30-40 years from now if/when your children have ownership (making an uneducated assumption on holding period).I hope your "other costs" is accounting for capital expenses such as eventual boiler, furnace, roof, driveway repair.

Lets make some general assumptions we lend you $64,000 80LTV to buy, lets say $10,000 in repairs,  total loan $74,000 gives you ltv on arv 59.2% we wat the number to 75%. 

A lot of people make the assumption they have all their ducks in a row but a judge will often just throw out the lease and side with the tenant regardless .