My tenants, who have been in the property for close to three years, have become totally unresponsive.

Totally agree.

Not enough information here to answer this question accurately.Is the home a total loss? 

He also said my GC could complete the install and knock 20k off the total, which I would do, so the total seems to be 355k to get the home in place.

I would venture maybe $20k total, conservatively. 

I resided in the home until summer 2020 (total 2 yrs 9 months) and then deployed overseas for the next 4 years; selling the home in June 2024.  

When you have a duplex and tenants on both sides stay for ten years, it almost guarantees that something isn't right.I would study your market and determine the value of your rental, because I bet you are losing money every month.

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

For instance, if there was a total of $250K of debt on those properties that woud leave you with $350K of proceeds to use to purchase $600K of real estate.  

Here's a breakdown of the situation:Current Occupancy: 80% (16/20 units occupied).Current Gross Rent Roll: $14,265/month.Market Rent Potential: $17,665/month (100% occupancy).Renovation Needs: 15 units require full renovation ($10K/unit), 4 units are 75% renovated ($2.5K/unit), totaling $160K in renovation costs.Vacancy Loss: $41,820/year in lost income due to current vacancies.Cap Rate AnalysisThe seller lists the cap rate as 9.59%, but this is based on the projected NOI of $119,858 (assuming full occupancy and market rents).