They're willing to work for hours on end, take business travel, commute excessively, miss their kids' life, have set limited vacations, etc.

So an ADU is a granny flat for a relative?  

@Tony MarcelleStale MLS listings are properties that have been listed on the MLS for excessively long periods of time and are no longer receiving much showing activity.

Some will have a lower percentage of rents, but will make it up on fees, so if you have a more turns it may cost you more in the end than a flat 10% of rents. 

When we have sellers doing flat fee mls listings, we always recommend using one.

It's beautiful flat farmland.

He quotes conservatively to make sure that happens, but I'd rather my numbers look good from a conservative rent quote and be surprised than have an excessive vacancy.

I am selling FSBO with a flat list fee.

What are you going to do with the excess cashflow from a 30yr mortgage? 

If you have slop behind it, that's from where most of the water is coming into your backyard - that wall should "capture" it and redirect it on the sides, and eventually, further out along the sides of your house following the natural ground slope (see pictures below).The backyard seems flat - one way or another you'll have to find a way to slope it and move water along.Just my 2¢.