A small-to medium-sized attached structure that consists of 2 to 8 multi-story dwelling units placed side-by-side. Entries are on the narrow side of the unit and typically face a street or courtyard. The street façades have entrances and avoid garages.

Typical Specifications

Lot Front-loaded Alley-Loaded
Width* N/A 18–25 feet
Depth* N/A 85–120 feet
Area* N/A 1,530–3,000 sq. ft.
  N/A 0.035–0.09 acres
Number of Units N/A 1-3
Typical Unit Size N/A 1,000–3,000 sq. ft.
Net Density N/A 11–85 du/acre
Gross Density N/A 10–20 du/acre
Parking Ratio* N/A 1–3 per unit
On-street Spaces N/A 1-2
Off-street Spaces N/Atd> 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.