Since you want to aggressively invest in the near future, you will need cash and the 30 year option is the right one for you.

@Michael ElliottSolara is just one of many resort communities that are specifically built for STR.

I even bought 3 properties in one day using the HELOC to fund the down payment on each of those purchases. 

Every dollar you lose to overhead is one less dollar for you to live on.Low crime.

There are several different kinds of exchanges with different rules and timelines, not just one type.

As already mentioned, you could sell via seller financing to lower AGI, as all you would have to claim is the payment income - until balloon payment received.Did know an investor that had 14 properties paid off and he moved into one every two years to then sell with the $250k single exemption.

Currently I am working with one bank in each market.

. - You can buy owner-occupied, live in one unit, and fix up and rent the other unit(s).- If you're handy, recommend buying a property in the worst condition you can tolerate.

When that happens you will only lose part of your cash flow rather than all of it if you have multiple DSTS vs one larger one.

I didn't see a need for a holding company but if someone wants one, you can just use another LLC as the holding company.