I'm not sure if there is an equivalent out there for us but I would love to know what they define as "horizontal income"

Where operable windows are required or desired, casement/awning are your best design, followed by tilt-n-turn, then your single/double hung and, bringing up the rear, your horizontal slider.Finally, it also pays to "tune" your windows to your location and the exposure where they will be installed.  

This is known in Nashville as an HPR (Horizontal Property Regime).Lot Details Size - 50x150 lotZoning - R6 - this allows one or two dwellings with at least a 6000 SF parcel.

We also installed a new bathroom and closet in that old garage (pictures 17, 19, 22) but it was easier to just make a flat horizontal ceiling over the bathroom and closet. 

I discussed your questions with my partner (who guides all our rehabs) and he concurs that the horizontal boards help with stability as Rick mentioned.

was going to glue 2" pink foam on bottom 24" of exterior block basement walls,,, then have electrician run conduit on top of that horizontally for outlets.

I suggest making your brush strokes horizontal to allow gravity to pull the lines of paint together.

While this is exciting and opens the door to opportunity, they really need investors to make the shift since they aren't used to buying the land and funding the build without the buyer already in tow.So I have an abundance of deals to do basically those parts, either develop subdivisions with all the horizontal infrastructure and sell lots, or fund builders spec homes in these developments, preferably all sustainable because a known stick builder can come in and build without any help.So if any of this interests you or you think I would be someone you want to know, drop me a message and we can talk all about it.

The more work a developer has to do upfront the less of a purchase price you get.For example a seller selling a piece of land zoned residential with a house on it.The developer will have to level the house or have it taken away, clear off all the trees and brush, then grade the land to get it site ready along with putting in horizontal improvements.Before they do all that not only will they need to get zoning changed but have their site plan approved with density needs, access points, etc.All of that a developer wants approved before they buy as their price to the buyer is based on the developers highest and best use in their projection model once finished.

A 4'0" x 4'0" horizontal slider is one of the easiest ways to meet this.