Four projects within six blocks of each other in Lenox Hill: a limestone townhouse on Cortizo, a co-op penthouse on custom steel, Marvin double-hungs and SIMPAS window walls on East 70th.
The Upper East Side is the concentration of our Manhattan work: four projects between East 64th and East 70th Streets, and each is a different problem. 165 East 64th Street is a limestone townhouse rebuilt with a complete Cortizo package, tilt-turn windows on a landmarked street front. The Tower House at 205 East 69th is a prewar co-op penthouse that required custom thermally broken steel windows with brass cremone bolts, through a board. On East 70th Street, one townhouse rebuild got Marvin Ultimate wood double-hungs on the front and SIMPAS aluminum sliding doors and window walls at the rear and terrace — two systems on one building because the street and the garden answer to different rules.
That is the Upper East Side pattern. The historic district covers most of the side streets from 59th to 78th between Fifth and Lexington, and much of Carnegie Hill; street-facing windows in it go to Landmarks. The rear is the owner’s. The co-op board is a third authority with its own specification. We work through all three.
Lenox Hill, Yorkville, Carnegie Hill, Sutton Place, the Upper East Side Historic District, Treadwell Farm, Henderson Place.
The Upper East Side Historic District and its extensions, Treadwell Farm, Henderson Place and Carnegie Hill are all Landmarks-reviewed for street-facing windows. Most buildings are co-ops or condos with alteration agreements. Local Law 97 applies to the larger buildings. See how a landmark window application runs and window replacement in NYC.
Yes. We measure the original, draw the profile, and submit to Landmarks with the application. 165 East 64th Street and East 70th Street are recent approvals.
Usually yes. The rear is not visible from the street and is not reviewed in most cases, which is how East 70th Street got Marvin double-hungs on the front and SIMPAS window walls at the back.
Yes; The Tower House at 205 East 69th Street is a recent example, with custom steel windows to the building’s specification.
About this page. Written by Alex GC Inc. d/b/a Alex Glass Construction and reviewed before publication by Aleksandr Chernovolenko, Managing Partner, with our design and estimating lead and a field foreman. Our foremen hold the NYC DOB Site Safety Training supervisor card and our crews the 40-hour worker card; we are certified to fabricate, install and service Alutech and Everest aluminum systems. Facts are drawn from our own projects, manufacturer test data and the applicable codes; where we are giving an opinion, we say so. Last reviewed September 2026. Credentials
Tell us the building and the opening. We survey, tell you what fits and what the approvals are, and quote from the measurements.
