If that is the case then you have all kinds of flexibility.Not trying to a be a jerk or rain on anyones parade those are just the shorcommings I see with the proposed solutions.

See if you can get the tenants to help be part of the solution.

You can go the HML route, but remember each month is a high payment, and based on what's left to construction, you may have a lot of months to have to cover those HML payments.The solutions are many.  

@William Hochstedler  in most states  all Liens except Ad VAlorum tax ( which is paid current when you buy at the tax sale) and IRS liens are estinguished with the tax sales.. they can attach to the old owner but are removed from the property.this is why banks monitor your tax payments and if they are not made they notify you and can pay them then foreclose if it gets serious.. if a bank does not protect there position they get wiped out..

I like offering solutions and education to motivated sellers.  

@Patrick LoshekFNMA allows transfer of deed to LLC if mortgage originated after June 1, 2016 and original borrower owns a majority interest in the LLC and any 12 months of owner-occupancy is first met. https://servicing-guide.fanniemae.com/THE-SERVICING-GUIDE/Part-D-Providing-Solutions-to-a-Borrower/Subpart-D1-Assisting-the-Borrower-with-Property-Related/Chapter-D1-4-Transfers-of-Ownership/Section-D1-4-1-Information-Relating-to-Transfers-of-Owner/D1-4-1-02-Allowable-Exemptions-Due-to-the-Type-of-Transfer/1041300841/D1-4-1-02-Allowable-Exemptions-Due-to-the-Type-of-Transfer-09-09-2020.htm

Here in Cleveland (and other cold weather climates), this kind of monitoring is especially important.

I used Royal Legal Solutions for all of my real estate needs.

A short term renter is a stop gap solution and comes with more turnover costs and ending up back in the same position you are in now, looking for a tenant.Better to start as you mean to go on, with a stable long term tenant.

Additionally, why bluetooth (very limited range) instead of Zigbee or ZWave which would allow it to be tied into building monitoring and automation systems.