As far as I know, because it's a flip I'm pretty sure you'll need to pay SE taxes (15.3%) and ordinary income tax (whatever your tax bracket may be) as well as any depreciation recapture you took in 2018 (this year tax return) which I would assume none because you were probably still in the process of renovating. 

@Lane Kawaoka Why would S e  C not want mass of the people to learn and get awareness on the subject? 

These are estimated taxes, so if you don't have earning per se, then there are no estimated taxes to pay.

You can schedule a vacation, fly to the ships location, land, hop on board, and tour the coast of SE asia, for example, by luxury of cruise ship for a few weeks.

But consciously saying I am going to take a low rate of return believing that the property I am buying or the city I am buying will go up in value is not a smart investment strategy.I have not seen that per se in this forum, but the conversation has tilted as it usually does on this site to strategies that are more prevalent like SFH investing.No matter what the strategy is, it is always smart for investors with this kind of money to exercise patience, educate themselves on opportunities and invest in the way that they are most comfortable - IMO.

Lauderdale and Miami.As for someplace the SE is high I think it can be considered above average but I'm no expert in this field.

Texas and SE.

Let's suppose you had that income, in this case contributions to your Solo 401k plan can be made from earned SE income, you can not use your W2 income to contribute into Solo 401k. 

What's a good way to do that without getting "double taxed" (paying SE tax on after tax W2 money)?

@Chris Heeren - you are correct about getting hit with S/E, so if you have a of of properties and depreciate them correctly its possible.