Other things to consider: do the trees impact the natural light on your property, offer shade, a wind barrier, greenery, birds...   

Below is an aerial view of Las Vegas in 2020, with the federal land shaded brown.As you can see, Las Vegas has little land left for expansion.

We just do it under the one shade tree.   

I'd try to keep them all the same, but if you have a backsplash where the darker switches and plates would look better, then use those in that area only. 

So we would drive out on the beach, find a good spot, set up some tarps for shade and start knocking back the cool ones.

or shade?

If at least 1/2 of hoems in your area have cement, go that route, it will add value and quickness to sale.Skip siding garage, do an earthtone to darker paint color and do minimum 2 coats.

There's usually a grey shaded area not too long after...

But see if the can make that menu icon when in phone view ( the hambuger) in a darker color

That's lower than what I'd take on a promissory note for sure, so Joe's point about making her a 1st lien-holder is a good one.0.75% per month is a shade over 9%. 0.70% per month is a shade under 9%. 0.65% per month is a shade over 8% per year.The reason I like stating the monthly interest amounts is that it makes the book-keeping very easy to do in Excel or even on a legal pad.