My thought was to build:1) detached ADU on the new lot with the existing home and 2) build a large SF and another detached ADU.Of note, in this county the ADUs can be up to 1500sf.

Every 4-5 years they would use the equity in their existing home to get a HELOC/refinance mortgage to purchase another house.

I do this because if you send emails to the wrong recipients (like the ones that don't exist anymore), then it affects your sender's reputation.

You'll also want to talk to an attorney to find out what you can or cannot do to the property after you buy it, especially in a redemption period if one exists.

an NDA agreement can exist between the two. or perhaps a consultant agreement so buyer do not cut the birddog guy.  

Now my question is I don't want to end up paying property taxes for the Sq footage that doesn't exist.

A safe way to exist in case of something like a fire.

After the dust has settled, you did not benefit from depreciation and did not suffer from depreciation recapture.The above effect exists whether you invest inside or outside a retirement account, same exact mechanics.

In PA, Special Warranty is probably the most common which guarantees the title against issues that came into existence during the seller's ownership.

Then I could start purchasing regular investment properties.Option B: Find an investment property first (higher interest rate) that pencils out while continuing to live in my condo, and then find another primary I could “trade-up” for with my condo, where I could eventually use it as LTROption C: Just focus on finding investment deals that pencil out at a higher interest rate with existing cash, and when I eventually move out of state, sell Condo.