A small- to medium-sized (2 to 3-story) attached or detached structure consisting of one dwelling unit above or behind a fire-separated flexible ground floor space that can accommodate a range of non-residential use. The flex space and residential unit typically have separate street entrances. The flex space typically has a taller height (min.10’) and a shopfront frontage. This type does not include a rear yard.

Typical Specifications

Lot Front-loaded Alley-Loaded
Width* 18–25 feet
Depth* 85–120 feet
Area* 1,530–3,000 sq. ft.
  0.04–0.09 acres
Number of Units 1-2
Typical Unit Size 1,000–3,000 sq. ft.
Net Density 11–56 du/acre
Gross Density 10–45 du/acre
Parking Ratio* 1–3 per unit
On-street Spaces 1-2
Off-street Spaces 2 per unit max.
Front* 10–25 feet
Side* 0–12 feet
Rear (main building)* 30–60 feet
Between Main and Accessory Buildings 10–20 feet
Building Size
Width 18–25 feet
Depth 35–55 feet
Height (to eave)* 25–40 feet
Floors 2-3.5 stories
* Varies based on context

Idealized specifications take the best characteristics of this type and update them for today’s typical building standards, serving as a model for new development.