We have several business and are looking to borrow against these mortgages. 

The investors in the secondary market have a very good grip on the prepayment risk associated with a drop in mortgage rates and use pricing or yield to offset this, which is why you so often hear of borrowers paying points and lender fees.

I only ask because every 10K gets you more and more borrowing power!

They show some creative ways to borrow money or to payoff debt using credit lines but their disclaimer is to see your cpa and/or lawyer.

I have four Canadian clients myself, but if you are in the LLC with a US citizen then the LLC can borrow under US citizen terms.

Start with your primary, rent out any spare bedrooms "house hack"Use that to practice upgrades, kitchen, bathroom, curb appeal... etcNow you have experience as a landlord and flipper, use that to buy a distressed propertyAdd 40% equity to the property through home makeover, refinance into a low cost mortgageNow you are cashflowing a healthy margin on a second property, use that to build equity over time, cashout later and buy your duplex/quad.If it's going to take you 10 years to save up a down payment for a small apartment building, yeah it makes more sense to start growing your portfolio with cheap SFR flips instead.Every market is different, every borrower is different, every property is different, it would be ill-advised to recommend anything without recognizing the individual's nuanced goals and objectives with their next acquisition.

.... review the borrower's exit strategy! 

I think this is doable with my midwest market, but difficult with current borrowing rates.

If I did my math correctly, on a 3,600 SF triplex where you buy the land for $150k, you generate a gross profit of about $84k (based on a $140/sf build cost and sale price of $205/sf), before you pay interest on any borrowed funds or closing/commission costs.

If you have the money, just use it, rather than borrow.