East 23 Street, S901, Manhattan 10010

This property may be subject to NYC’s non-primary residence (pied-à-terre) surcharge.

Market value (FY27)
$1,546,606
Estimated annual surcharge
If non-primary, est. $61,864/yr · 4.0% tier (Class 2, $1M–$3M)
Owner of record
South Tower 121 Llc
Borough
Manhattan
Block / Lot
878 / 1144
BBL (PARID)
1008781144
Tax class
2
Building class
R4
Apartment
S901
Condo number
102633

Estimate = phase-1 rate × FY27 DOF market value. Co-op unit values are imputed by DOF at determination; see methodology.

Ownership records

Last deed recorded December 15, 2025 for $6,125,000. Klingbaum, Leonard → South Tower 121 LLC

  • Seller Klingbaum, Leonard
    6 Lyndale Park, Westport, CT 068801228
  • Buyer South Tower 121 LLC
    121 East 22nd Street, S901, New York, NY 10010

Public ACRIS deed records and HPD registration data. LLC officers are not published by New York State; parties and addresses shown are as recorded.