Worth bring forward: Ralph Segal’s comment on “Special Density – A Vision“:
I’ll look forward to seeing (Vision Vancouver candidate) Diego Cardona’s six-home proposal on a single family (RS-1) lot. And whether it has any similarity to the four-unit idea for a 33-foot-wide lot I showed Neal Lamontagne last year which he then posted on Price Tags in April, 2016.

Be sure to peruse the 23 comments from some savvy folks such as Michael Mortensen, Frank Ducote, Thomas Beyer, jolson et.al. which are just as relevant today as they were last year.  (Click here and scroll down.)
Of course, the number of units in that modest idea can easily be increased to Diego’s six homes by adding one more on top of each of the two structures shown, with just a few more feet of height added to today’s RS-1 height limit.
The key to any number of variations on this theme is to avoid getting hung up on density (FSR) as a number, increased from present 0.6 FSR to 1.5, 1.75 … take your pick … and then test it to arrive at an optimum but liberal maximum, recognizing the over-arching objective of delivering more housing supply.
And recognize that parking provision on site can and should reduced – no more than two spaces on a 33-foot lot (possibly three with a bit of a squeeze). Finally, anticipate and facilitate within the new zoning schedule the ability to strata title.