We are thinking of adding more in the future depending on the relocation plans.Buying a new property in Seattle will mean a new mortgage for 30 years and very likely incur a high DTI with high monthly payments.

Are you strapped for the down payment?

.- $14,970 in change orders, thus far.At two years since lot purchase, loan costs have added up between closing costs, interest payments, and extension fees, as well. 

I’ve done some research and have found that some banks will allow the seller finance portion from the seller to go towards the down payment of the loan, is that true?

On the lease, he'll pay me $100/m over my HELOC payment and all other expenses, including the refi cost, inspections, title work, etc... 

Consider tenant stability, including consistent payments and maintenance of the TOH.

Quote from @Jaycee Greene: Assuming you pay asking price, I'd estimate the down payment for something like that using a hard money loan (HML) would be around 40% of the purchase price and your monthly payment would be $2,600 with an interest rate in the low 7% range (probably need a 700+ credit score to get that).

Some companies call this a markup for managing the payment of utility bills.

And when their methods don’t work and you turn to your favorite guru for advice, what do they tell you?"

It is what is left after snow removal, cutting the grass, utilities, tenant issues, parking lot issues, property taxes, mortgage payment, etc. that make a difference.