LocalForesight LocalForesight
Join

555 Saw Mill River Rd

Sign in to follow

555 Saw Mill River Rd is a commercial proposed at 555 Saw Mill River Rd, Ardsley, NY 10502, USA in Greenburgh, NY. The project is currently pending before local land-use boards. Loop Road Holding LLC (Regeneron Pharmaceuticals Inc.) is listed as the developer on the public record. LocalForesight has tracked 1 public hearing appearance before Planning Board.

Project Overview

555 Saw Mill River Rd

Regeneron Pharmaceuticals, through Loop Road Holding LLC, proposed a commercial development at 555 Saw Mill River Road in Ardsley, Greenburgh. The project involves expansion and modernization of pharmaceutical manufacturing and research facilities on the site.

Subscriber content

Upgrade for full access to project intelligence.

Upgrade

Property Stats

Status Pending
Type Commercial
Address 555 Saw Mill River Rd, Ardsley, NY 10502, USA
Developer Loop Road Holding LLC (Regeneron Pharmaceuticals Inc.)

Map

Timeline

Jun 17, 2026
Planning Board
  • No vote taken; discussion and conditional feedback only
  • Applicant (Regeneron/Loop Road Holding LLC) proposed reducing Logistics Building from 136,000 sq ft (4 story) to 37,500 sq ft (1 story), reducing wetland buffer disturbance from 0.82 to 0.75 acres and steep slope impacts
  • Key unresolved issue: truck routing via existing temporary parking lot and circuitous 90-degree turns vs. previously approved direct pink route or new straight route across green restoration area
  • Board requested disturbance and grading comparison for alternative routing options and photos of existing retaining walls
  • Applicant seeking to retain temporary parking lots (Lots 10 and 14) originally approved for removal/restoration, citing operational flexibility for future campus projects and contractor staging

Next steps

  • Applicant to provide disturbance and grading comparison analysis for alternative routing options (direct route vs. pink previously-approved route)
  • Applicant to submit photographs of existing retaining walls and site conditions
  • Board to schedule follow-up meeting (date not specified) with applicant, engineer, and deputy commissioner to review submissions and finalize routing and parking lot retention decisions
  • Board to make recommendation to Town Board on amended site plan; Town Board is lead agency and referred matter to Planning Board for review and recommendation

Subscriber content

Upgrade for full access to project intelligence.

Upgrade

Sentiment

6 /10

From Planning Board · Jun 17, 2026

  • Board supportive of reduced building footprint and environmental disturbance improvements but skeptical of truck routing justifications; Chair questioned whether cost-cutting rather than engineering constraints drove route choice given 50-year building lifespan
  • Deputy Commissioner Schmidt raised concerns about retention of temporary parking lots originally mandated for restoration, questioned feasibility of direct routes, and noted precedent of other temporary lots (Lot 13) being converted to permanent; no public comment recorded
  • Traffic consultant John Canning questioned routing efficiency, suggesting direct route across green area (approximately 8-10% grade over 280 feet) may be feasible despite applicant claims of steepness and desire to preserve flexibility for future north-area development

Subscriber content

Upgrade for full access to project intelligence.

Upgrade

Related Projects