Sacred Heart • Otto Kahn Mansion

Kingswood was commissioned to participate in an expansive Restoration / Renovation of the entire building.


  • Replicated upper floor windows and doors, upgrading glazing, weatherstrip and hardware.
  • Predominant window is a French inswing casement with an embedded outswing wicket sash. Original glazing was true-divided Lead caming with mitred corners and intersections, seated with an ornate, Lead bolection mould.
  • The existing frames and transoms underwent a typical restoration, stripping, Dutchman repair, sanding, refinishing. The existing sash were beyond repair and discarded. We fabricated new mahogany sash, matching the existing in design and aesthetics, incorporating upgraded weather-stripping and hardware.
  • For the glazing, we replicated the existing lead caming and bolection mould, and upgraded the glass to Laminated Low E for improved thermal efficiency and sound reduction.


  • Address: 1 East 91st , Manhattan
  • Architect: J. Armstrong Stenhouse
  • Restoration Architect: Easton Architects
  • Current owner: Convent of the Sacred Heart, Upper and Middle School
  • Designated New York City Landmark
  • Listed on National Register of Historic Buildings
  • 2010 Recipient Lucy G. Moses Preservation Award

“In its grand scale, distinguished design and superb construction, the Otto Kahn House is the finest Italian Renaissance style mansion in New York.” – The Landmarks Commission


  • Single double and triple hung windows – balanced with mechanical balances or weights and chains
  • Inswing and outswing casements – fitted with roto or multipoint hardware
  • Pivot windows – vertical or horizontal, fitted with multipoint hardware
  • Circles and ovals – fixed or operating
  • Monumental windows
  • Awning and hopper windows – fitted with roto or multipoint hardware
  • French doors with multipoint hardware
  • Motorized operation
  • Lift/Sliding doors
  • Entry doors
  • Historic storefronts
  • Custom fencing and gates
  • Custom lineal trim