There probably won’t be an affordable way to refinance them for the repairs, if there is it will be expensive. 

The 1980s (which was a long time ago) may have had higher interest even compared to today’s rates and been less affordable. 

I can afford a 700K home with 25% down on a 6.5% interest rate.

A lot of investors based in markets like California and New York are choosing to purchase their investments OOS in the Midwest because of the affordability and numbers making more sense.

Got some IO and also 30 year amortization for some of the BTR product we have acquired. 

Affordable first time family homes. 

Yes, it is a paid product, but it is worth every penny.

Doubling up on deposits or requiring larger deposits might weed out some of the riskier tenants upfront, though it's not always a foolproof solution, especially in markets where affordable housing is tight.Regarding your point about double security deposits, you're absolutely right-this can be an effective strategy.

If she violates your notice and refuses to leave, I believe she will lose her voucher and her ability to afford another rental.

HELOCs are very much a short term product, because the interest rates can go up precipitously, they have been called due in past credit crisis situations.