Montgomery County · Lower Gwynedd · MCPC #26-0051-001
BT 309 Development
NORRISTOWN RD, Lower Gwynedd, PA · 278 homes, 46,750 sq ft non-residential, mixed use · 24.0 acres
About this project
The developer will transform a 24-acre office park in Lower Gwynedd by replacing one of two existing buildings with a four-story apartment tower of nearly 280 units and internal parking, while retaining the other office building and adding new retail and office structures. Integrated parking and pedestrian walkways will serve both residential and commercial tenants. The rezoning from special-use to multifamily residential district is needed to enable this mixed-use development.
County planning commission: Supports, with comments
Issues raised: Community impact statement missing from application requirements, Workforce housing administration needs clarification, Impervious surface and stormwater management, Green parking strategies and sustainability measures, Building design standards for massing and façade, Parking ratio flexibility and redundant reporting
- Applicant
- BT 309, LLC
- Zoning
- MF-3
- Approvals needed
- rezoning, text amendment, conditional use
- Demolition
- existing two-story office building
Filing history
- 2026-03-04 · MCPC #26-0051-001 · Prelim Plan, Conditional Use · 278 homes · 46,750 sq ft
Scope estimate for contractors
Estimated construction value: $167.8M
- ~8,896 roofing squares
- ~278 HVAC systems
- ~278 kitchens / 556+ bathrooms
- ~778,400 sq ft of finished living space
- ~116 roofing squares (assumes 4 stories)
- ~116 tons of cooling (rule of thumb 400 sq ft/ton)
- ~19.0 acres of site work (grading, stormwater, landscaping)
- Demolition of existing office building
- Multi-story residential building with internal structured parking (433 spaces)
- Three new commercial buildings
- Pedestrian site design with walkways
- Landscape and green infrastructure features
- Workforce housing component