Fall 2015
What follows is a placeholder for the much more extensive paper de-stereotyping Seattle's initial 1923 zoning, which designated existing "mansions" and almost all undeveloped land (lots of it back then) as Resident 1 (Single Family) then designated working class homes as Resident 2 (Multiple, i.e. MF) (lots of it back then). Optimism, following a post WW1 recession, zoned Seattle in 1923 for the homes and businesses of one million people. Many years passed before demand for in-city SF zoned homes began to exceed supply, but when it did, those thrifty-by-necessity bought in-city MF zoned homes at "use value." Of course, this no longer works today.
Pre-zoning, most of Seattle's working-class plats were at 25' lot frontage intervals. Seattle's initial zoning set a minimum of 40' lot frontage intervals. Later (1950s) amendments revised that to 50' frontage to accommodate a driveway for on-site parking. The initial zoning ordinance, part of a wave sweeping the country—Seattle's purchased at a bargain basement price—was simplicity itself, eminently accessible to all persons of normal intellect. 92 years later: "law sufficiently complex is the same as no law at all."
Below please (eventually) find a bulk study showing one configuration of the 2010 Design-Freedom MF Code maximization of a 50' wide 5000 sf lot (once, the minimum lot size for an affordable market-rate tract house). Minimums tend to become maximums, but in addition today law sufficiently complex can be readily mined for loopholes that elected officials willingly, or as useful idiots enable.