My lender stated he could make that work (fingers crossed).

You can also network to gain private money lenders, lean on hard money lenders, and a continue to grow relationships with local lenders that may allow you to get creative through things like cross collateralizations. 

Fingers crossed and thanks again for the input. 

@Dariush Vaziri if you don't mind any work, I'd look in PG close to the border - Capitol Heights, Temple Hills, etc - might need small upgrades.

but thanks.. so far so good.. fingers and toes crossed and all of that..   

That's another option I'm considering for a house hack--we just put an offer in on a SFH in Mar Lee so fingers crossed but if it's not this one there will be another!

But as a first-time buyer this didn't even cross my mind.

To do a break even analysis like you're talking--strictly in terms of $$$ and negating the risk of having a note come due 24 months sooner--you simply run out the interest expense for each year over 7 years on both loans (include a refinance of the 5 year for an additional 2 years) and see where your cross the line. 

Fred describes "cross collateralization"  which is not a definition for "portfolio loan." 

If the numbers pan out, I’d also like to partner up on the deal with someone more experienced, but we can cross that bridge later.