1031 scenario question

[Bradley Hendrix]

Hey 1031 experts I have a scenario question for you.

Bought an apartment building with a construction loan of $565,000. The purchase was $375,000 and the rest was used for renovations.

My cost bases in the building will be around $740,000.

I refinanced the building with a $900,000 loan.

I have an offer on the building of $1,400,000

Total capital gains would be about $660,000

So, my question is after selling the property (for easy math) lets say I walk away with $500,000 after paying off the bank loan. When I 1031 the next property do I have to show putting down the whole capital gain amount of $660,000 or just the $500,000?

Thanks