Building house to resell. Need advice with exit strategy, 1031?

[Joe Sno]

I bought a house several years ago on a big lot and subdivided the land.  I sold the house and was left with a buildable lot free and clear.  I am currently having a house built on it now (foundation just got poured so have some time to decide).  I am using about $100k in cash and $250k from my heloc to pay for everything.  The house should sell for about $650k so leave me around $250k to reinvest after real estate fees.

What would be the best way to move forward?  From my understanding, I can't 1031 it unless I rent it out for about a year.  At that point, I still wouldn't be able to pull any money out to pay myself back and pay my heloc off so I would likely reinvest the whole amount to say a million dollar quadplex.   Then from my understanding, I could cash out refi but that would likely cost 3-5%.  Am I better to just pay the long term capitol gains?  From my understanding, 15% on just the profit so $37,500?

Any other strategies are welcome except I don't want to move into it for 2 years.  Thanks in advance.