Berkeley Insurance seeks to demolish and rebuild 475 Steamboat Road; neighbors press for post‑construction noise check

Berkeley Insurance presented a plan to demolish its existing office at 475 Steamboat Road and replace it with a new, energy‑efficient building on essentially the same footprint, with subsurface parking and updated mechanical systems intended to meet a LEED‑level performance target.

“We are fitting the building with automatic interior shades…so that there is no light leakage,” said Jeremiah Hancock, the project architect, describing measures to cut nighttime light spill and use bird‑safe glazing. Hancock added the design includes shades that “will close automatically at the earlier of 1 hour after sunset or 7PM.”

Acoustics were the central neighborhood concern. Chris Kizon, the applicant’s acoustical consultant, told commissioners the firm modeled a worst‑case scenario and found that combined rooftop heat pumps and an emergency generator meet the town’s nighttime criterion of 45 dBA under modeled conditions. Stillman, a neighbor who has documented prior elevated noise readings, said he measured 52 dBA at his deck and asked that rooftop monitoring be required at rooftop elevation as well as at property lines.

The applicant agreed to a post‑construction noise verification test and to include absorptive lining inside the proposed acoustic louver enclosure if required. Demolition logistics — including asbestos abatement, potential rock removal and whether explosives would be used — prompted requests for a detailed construction phasing plan, a neighborhood communications plan, and confirmation of pre‑blast surveys and seismograph monitoring if blasting occurs. Tom Hegney, counsel for the applicant, said the firm has retained a construction‑management company and will submit a phasing plan and coordinate required environmental controls and permits.

The commission left the application open and requested a construction phasing and logistics plan, a consolidated response to conservation recommendations on planting and screening, DPW and sewer flow documentation and the applicant’s post‑construction noise verification protocol.