Marcel Bartumeu Ramentol
CONTENTS

THE INDEX · SMALL TOOLS FOR CITY RULES

SF small-lot explorer

  • LIVE
  • PUBLIC CODE
  • MAY–JUN 2026

LIVE MAP ↗ CODE ↗

PROBLEM

Single-stair code reform would make small lots buildable for small apartment buildings. How many lots qualify?

SYSTEM

The minimum rotated rectangle of every parcel in the San Francisco Assessor map (about 226,000 parcels), in US feet; an interactive Leaflet viewer; and a Culver City counter-example.

EVIDENCE

29,701 (15.7%) ideal-band and 63,119 (33.3%) flexible-band lots out of 189,636 residential-zoned lots.

In Culver City only 14 of 7,401 residential parcels (0.2%) fall in the flexible band.

STATUS AND LIMITS

The counts are a geometric upper bound.

MY ROLE

I wrote the analysis and the viewer; the first version took a week in May 2026.

SOURCES AND STATUS FOR THIS PAGE · 9 CLAIMS
ClaimStatusSourceChecked
Single-stair code reform would make small lots buildable for small apartment buildings. How many lots qualify?OWN WORDINGSF small-lot explorer README2026-10-10
The minimum rotated rectangle of every parcel in the San Francisco Assessor map (about 226,000 parcels), in US feet; an interactive Leaflet viewer;…OWN WORDINGSF small-lot explorer README2026-10-10
29,701 (15.7%) ideal-band and 63,119 (33.3%) flexible-band lots out of 189,636 residential-zoned lots.DERIVED FROM DATASF small-lot explorer README2026-10-10
In Culver City only 14 of 7,401 residential parcels (0.2%) fall in the flexible band.DERIVED FROM DATASF small-lot explorer Culver City report2026-10-10
The counts are a geometric upper bound.OWN WORDINGSF small-lot explorer README2026-10-10
I wrote the analysis and the viewer; the first version took a week in May 2026.OWN WORDINGSF small-lot explorer repository history2026-10-10
LIVEVERIFIEDSF small-lot explorer, live map2026-10-10
PUBLIC CODEVERIFIEDGitHub repository2026-10-10
MAY–JUN 2026VERIFIEDRepository history2026-10-10