Emailed a buyer Payment & Closing Cost estimates on this 545k Condo in Orange County, CA.

We compared:
10% Down
15% Down
20% Down
25% Down

What's interesting is there was NO rate improvement unless the buyer put 25% down.

Banks should reward you for putting more down.

When they don't, 20% down isn't always the right way to structure a purchase.

790 Credit Score for this buyer, so the monthly PMI was affordable too. 
Only $70 per month at 10% down.

If the buyer prefers to keep 54,500 in their pocket for cash reserves, it's worth considering 10% down instead of 20% if they're comfortable with the total payment.