If you mean security backed by collateral, you are correct.

There funding is almost never secured for more then a year at a time.

New tenant must go through complete vetting, sign the lease, pay security deposit and rent, and move in, prior to the referring tenant getting their $100.

Unfortunately, the husband lost his job about 8 months ago and, from what I'm told, hasn’t been able to secure another one—not even in retail or fast food.

For the past two years, my primary income has been my Social Security, and my home is fully paid off.

For my units, I usually look for someone with annual income 40x the monthly rent so I know they are financially secure. 

To minimize time the property is vacant, have the Realtor coordinate with the existing Tenant for the last 30 days of their occupancy for showings so you have the best possible chance of securing a new Tenant without a break in between.I would love to know some of the details of your property, and do a rental rate check up to confirm you have the right price. 

Being a 20 year mortgage expert and real estate investment veteran, we used our mortgage company to secure below market financing.

You shouldn't need her social security number to file for eviction.

My strategy would then be to lease at least two of the renovated units, increasing occupancy to 90%, which could improve the chances of securing favorable terms for refinancing.I haven't pitched it to the seller yet.