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Concord planning board reviews MBTA zoning overlay scenarios after state comments
Summary
Planning staff showed three GIS scenarios testing MBTA Community zoning overlay compliance; scenarios met unit-capacity or station-area targets but fell short of a new single-contiguous-district acreage test, and members asked staff to run additional options including whether the MCI Concord parcel could be included.
Planning staff presented three GIS-based scenarios on Oct. 1 to test how the Town of Concord’s proposed MBTA Community zoning overlay would meet newly emphasized state requirements, and board members asked staff to refine options, run additional models and plan public outreach.
Elizabeth, a town planner, told the board she ran multiple permutations to show how small parcel additions or deletions affect three compliance metrics: a modeled unit-capacity target (roughly 1,094 units), the share of overlay acreage within a half-mile station area and a newer requirement that at least one single contiguous district equal 50% of the overlay’s total land area. “This scenario adds … additional lots to Subdistrict 4,” Elizabeth said, describing a test that produced a station-area share of 58% and a modeled unit capacity of about 1,205 units but only 42.81% in a single contiguous district—below the ~50% threshold.
Board members pressed staff on the practical effect of zoning versus development. Elizabeth emphasized the modeling is theoretical: zoning does not require construction; the model estimates what could be built under the proposed dimensional and setback rules, floodplain and wetland constraints and height limits. One board member called attention to a quirk in the state test: removing floodplain or other acreage can raise modeled unit capacity and change compliance outcomes. “It really points out a flaw in how the state law was written,” the member said.
The planner ran variants: removing Subdistrict 2 (Concord Oil/Concord Lumber) reduced total acreage and raised the percentage within the station area but left the single-contiguous acreage below the requirement; a different configuration produced contiguous acreage above 50% and a modeled capacity of roughly 1,429 units. The Thoreau Depot area, with many small lots, presented the greatest challenge—the largest contiguous district in that scenario measured 31.55 acres against an estimated 43.94-acre requirement.
Members asked staff to test whether including the 51-acre MCI Concord property (currently state-owned) would close the gap if the state disposition process allows inclusion. Elizabeth agreed to run that scenario and to ask the GIS analyst to prepare additional maps for the board’s next meeting. She also proposed a public forum in January and targeted outreach to property owners who would be affected by any overlay change.
Board members debated timing and risk. Elizabeth reported the state Historic/Landmarks Commission (HLC) has a long review queue and she expects formal review to be delayed; some members suggested waiting for definitive state guidance before placing an item on the warrant, while others said the board should develop compliant options now to avoid later rework.
Next steps: staff will run targeted scenarios (including an MCI Concord inclusion test and clarification of what counts as contiguous under the state guidance), prepare refined maps and plan a public forum for community feedback prior to any warrant action.
