We're killing the principal balance!

Assuming 20% financing (60,000 down payment), 4.5% interest rate, 25 year loan, which would be a total principal and interest payment of $10,691.23 for the year your Cash on Cash Return or ROI would be 10.5%. 

When devising a balloon payment you need to look first at the agreed terms, amortization and rate, this gives you a schedule for the principal remaining at the end of each year.

The current owner is shopping it around for 1.35m (7cap) and the proforma numbers are as followed: ANNUALIZED INCOMEActual MarketGross Potential Rent $191,639 Less: Vacancy ($5,749) Effective Gross Income $185,890 Less: Expenses ($91,497) Net Operating Income $94,393 Debt Service ($65,592) Net Cash Flow after Debt Service $28,801 Principal Reduction $17,403Total Return $46,204 ANNUALIZED EXPENSESActual MarketProperty Management Fee $9,582 Replacement Reserves $5,250 Building Insurance $6,712 Maintenance $12,560 Taxes - Real Estate $36,296 (37220 w/o exception)Utility - Electricity $2,453 Utility - Gas $12,369Utility - Water/Sewer $6,275 Total Expenses $91,497 Expenses Per RSF $8.39 Expenses Per Unit $4,357I did some additional digging and found that they offer Wi-Fi for the building (I talked to a rep and said providing service for a building that size should run 285 a month) and the trash was left off which runs about 285/month.

SO the effective date of reaching the 78% LTV (where you need to get to using market appreciation and principal reduction) will likely be a lot sooner than 6.5 years using principle reduction only. 

No seller wants a bank mortgage ahead of their mortgage if they are holding 75% of the principal.  

How much of your cashflow pays principal vs interest?  

You might want to learn advance creative negotiation methods.I don't care where you go in the US, there are deals to be made if you know how to negotiate them.Maybe some ideas on creative methods will help you find what you are looking for.Try, Hybrid offers, delayed settlement, principal mortgages, vertical break ups, take backs, study periods, subject to public auctions, friendly joint ventures.Control and Roll is a great way to sell properties you don't own and to make fantastic profits.Charles

It all depends on your threshold for risk on which strategy to do with this...Just keep in mind that if you don't pay anything towards the principal, you are not paying the house off...

LTV is approximately 63% $475k loan, value around $750kDecent cash flowCouple of capital projects coming up in the next 2-5 years totaling about $25kHere are my options:1. 30 year fixed at 4.125% - principal & interest payments2. 1st position HELOC tied to prime less 1%, adjusts when prime adjusts, can lock the rate sheet of the day (at any time) to a 5, 7, 10 ARM at 5 year treasury swap (H.15) rates plus 2.25 or 2.625 - minimum interest only payments due during first 10 years (I would continue to pay down principal).