Numbers to know: Nextdoor.com gets Mayor Mike’s approval, New Museum Building’s pricy condo listing trumps competition … and more

“Numbers to know” is a weekly web feature that catalogues the most notable, quirky and surprising real estate statistics. Nextdoor.com partners with the city, the New Museum building is the priciest building downtown and an upstate “castle” hits the market.

$895,000
Listing price of the so-called Amsterdam Castle in Amsterdam, N.Y. — the medieval-looking home served as a base for the infantry from the Civil War through 1995 [Zillow]

55,503
Number of vacated foreclosed homes in Florida — the state accounts for 33 percent of the national total [RealtyTrac]

$5,636
Price per square foot of listings at the New Museum Building — the most expensive Downtown, thanks to one $42 million listing [CityRealty]

2,593
Number of new construction units approved to be built in New York State in April [U.S. Census Bureau]

1,800
New York City neighborhoods that the social network Nextdoor.com, which recently partnered with the city, covers [Mayor Michael Bloomberg’s Office]

267
Units in the Bedford-Stuyvesant-based Willoughby Court Apartment Complex, which is getting a new playground today, entirely built by volunteers [Press Release]

$61.95
Average asking rents per square foot in Manhattan office buildings [Cassidy Turley]

17
Percentage increase in home prices nationwide in May year-over-year [Redfin]

6.8
Percentage increase nationwide in new residential construction month-over-month in May to 914,000 units [NAHB]

4
Percentage of first-time homebuyers nationwide who paid all-cash for a home in 2012 [DoorSteps]