Purchase price: $264,000 Cash invested: $120,000 Sale price: $640,000 Duplex caught on Fire.

Also, important to confirm they will be warrantable condos for end buyers otherwise it will be very difficult for end buyers to secure financing and thus purchase the units. 

You are not allowed to compound interest.If you bought the certificate from the state on a best price offer, you charge interest on your purchase price, not on the full amount of the taxes that were due, but were not paid by you when you purchased.After you obtained your tax deed, you are entitled to something called "mesne profits" if you file an ejectment lawsuit against the former owner and they redeem during that lawsuit.  

There is a lot of news around how multifamily is in trouble with ARM's and overpriced purchases in 2025.

Purchase price: $172,000 Cash invested: $43,000 We purchased this rehabbed home and added a privacy fence, removed overhanging trees, finished the countertops, built a firepit, security system, camera's, fixed the sidewalk and turned it into an airbnb.

Both properties have a substantial amount of equity that’s essentially sitting idle.Would it be a good idea to tap into this equity (through a HELOC, cash-out refinance, etc.) to fund future fix-and-flip projects or purchase additional rental properties?

You could house hack by purchasing a small multifamily with an FHA or conventional loan, reducing your living expenses while building equity.

Quote from @JooYung Choi: Have you considered purchasing a short term rental?

I'm a new investor, looking to make my first purchase in Ulster County. 

I have an Acquisition Analytics service for Business purchases that are under $5mil in revenue, that I do with my Bookkeeping Firm.