The sources of the figures in this index (except where noted) are the annual assessment and sales figures published by the NYC Department of Finance, which are incorporated into a database application by the Henry George Institute. Copies of this user-friendly app (for PCs) are available, with full instructions, on a DVD. We’ll send you one if you ask (and if you wanted to send us a tax-deductible donation, we’d appreciate that, too).

Property tax revenue from buildings as a percentage of total tax revenue: 24%

Personal income taxes as a percentage of total tax revenue: 19.4%

General sales taxes as a percentage of total tax revenue: 13.3%

Property tax revenue from land as a percentage of total tax revenue: 18.2%

Total assessed value of New York City land: $434.1 billion

Average “full market value” of 2,843 vacant lots that have sold since 2005, according to the assessment rolls: $620,946

Average sale price of those 2,843 lots: $2,139,704

Number of those lots that are still vacant: 1,671

Average sale price of a Class 1 (small residential) parcel in Manhattan: $4,533,375

Average sale price of a Class 1 parcel in the Outer Boroughs: $558,903

Percentage of Class 1 parcels that are in Manhattan: 0.9%

Average “full market value” of a Class 2 (apartments, not condominiums) parcel in Manhattan: $7.89 million

Average sale price: $5.69 million

Percentage of of all NYC housing units that are rentals: 68%

Average sale price of a residential condo unit in Manhattan: $1,556,296

Average “full market value” of a residential condo unit in Manhattan: $278,246

Percentage of residential condo units that are in Manhattan: 49.5%

Ratio of effective property tax rate on Class 2 apartment buildings to that for Class 1 residences: 5/1

Median income of renters in NYC: $38,000*

Median income of homeowners in NYC: $79,250*

Number of non-city-owned parcels in Manhattan with an assessed building value of 20% or less of their assessed land value: 4,750

Number in the Outer Boroughs: 57,843

Total area of non-city-owned vacant lots in NYC, in acres: 9,406

In square miles: 15.2

Current “full market value” of the Gansevoort Park Hotel’s lot (103×142 ft.) $8 million.

Price paid in 2005-06 for the four parcels combined to build the Gansevoort Park Hotel: $31 million

Combined “full market value” (2008) of the buildings that were demolished on those four parcels: $4.7 million

Approximate cost of demolishing a 5-story building in NYC: $80,000

Average “full market” land value per square foot, in 2004, of 5 parcels (pictured above) bundled together to build “The Brompton”: $422

Sale price of these five parcels in 2006, per square foot: $4,944

Average sale price of a unit in this building: $2.4 million