Project Description

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One Madison Avenue

The redevelopment of One Madison Avenue involved a multi-phase foundation improvement and enlargement to facilitate the partial demolition and construction of a new midrise office tower while maintaining the façade of the original structure.  During phase 1, Standard Concrete & Excavation was responsible for footing and column enlargements throughout the structure to facilitate the core demolition.  During phase 2, a new foundation was then excavated and constructed within the existing building core.  This logistically challenging scope involved rock excavation, dewatering, rock anchor drilling and a large mass concrete foundation mat, with areas exceeding 15’ of total concrete thickness.  Standard Concrete & Excavation was able to facilitate the mobilization of large rock breaking equipment inside of the structure and instituted a dual-shift construction schedule in order to bring the project to completion ahead of schedule.

Scope of work:

  • Existing column and footing enlargements from subcellar to 10th
  • Rock excavation, including a 20’ deep rock cut from existing subcellar slab inside existing core. (45’ total depth below sidewalk elevation).
  • Installation of 600 KIP permanent rock anchors .
  • Installation of underpinning, soil, and rock anchors for support of excavation.
  • Foundation concrete, including areas of mass concrete mat exceeding 15’ in total thickness.
  • Grace waterproofing system.

Project Details


March 2022


SL Green Realty Corp.


Tishman Construction Corporation


Severud Associates

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