Utilizing my relationship with a great local lender I started the process of getting a secured line of credit set up against the 3 unit so I could pull most of my money back out.

It’s astounding how many fake documents are circulating today—you can find everything from fake references and stolen Social Security numbers to falsified income documents.To combat this, we rely on tools like Plaid, Verifast, and Snappt, which are excellent for verifying financial information and detecting fraudulent activity.

You can also promote it on STR outlets (or your agent should).

If you could see that the population growth was increasing, then you could invest with some security. 

Do you have any suggestions on how we can secure long-term financing under these circumstances?

When rates re-trace and other folks start trying to deploy the capital, I want to know I secured the (right) asset.

I completely agree with @Ashish Acharya's points about the cost-effectiveness of a HELOC and the potential credit implications if it’s secured by your primary residence.

This could help secure a higher LTV while you build STR rental history.

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. 

Quote from @Phillip Austin: There are two alternatives to a security deposit, which I speak about in my book.