Polygon enclosing the top quintile of (employment density + assessed land value + transit accessibility), trimmed at the contour where commercial FAR < 5.
Counts of num_skyscrapers (buildings ≥ 100 m / 328 ft), num_buildings_over_10_stories, and buildings_over_500ft are pulled from cities.cities. Our underlying inventory lives in buildings.buildings (96 fields), reconciled against CTBUH and Emporis snapshots where available.
cbd_avg_far, max_allowed_far, typical_commercial_far, typical_residential_far — assembled from municipal zoning documents.
gdp, metro_gdp, median_household_income, sector employment shares (sector_finance, sector_technology, sector_government) — BEA + BLS QCEW.
public_transit_score, walkability_score, avg_commute_time_minutes — Walk Score and ACS.
FAR numbers are estimates where municipal zoning is not codified as a single ceiling; vertical_density uses CBD sq-mi from our own polygon set and may differ from other published density measures. International cities are present but their state column is blank.