I don’t know what the interest rates are right now on a %600K+ loan, but fixed rate, i’m guessing it’s in the neighborhood of 4.5%. So for every dollar you do NOT borrow, you’re getting an absolutely, positively, better than US govt debt, guaranteed return of 4.5%. If you have a high degree of confidence you can continue to generate 7% return, borrow as much as you can at that rate, you’re picking up 2.5%.
Then there’s also the risk that the market takes another swan dive. Lower down payment, lower exposure in case the value drops below the debt.
Tough call. Great to be in a position to have the flexibility to need to choose.