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Transportation Development Review

This page is dedicated to transportation development review for large developments. 

We want to make sure new large developments fit in the neighborhoods they are planned in. Large developments are any developments that take up a gross floor area of 50,000 or more square feet. The development review process requires developers to evaluate existing transportation conditions. City planners and the community give their input and comment on the new development. Developers work with City planners to reduce their development's transportation impacts. At the end of this process, the developer signs a legal agreement with the Boston Transportation Department (BTD) called a Transportation Access Plan Agreement (TAPA).

The TAPA agreement specifies commitments that will reduce a development’s transportation impacts. These commitments can include improvements such as:

  • installing traffic signals
  • installing bike lanes, and
  • adopting commuter incentives to reduce driving.

Developments under 50,000 square feet are not usually required to submit a TAPA.


The dataset below includes all known, executed Transportation Access Plan Agreements (TAPAs) for large developments over 50,000 square feet from the 1980s to the present day. Each datapoint includes a PDF of the original executed TAPA.

List of all known, executed TAPAs 

About the dataset

TAPAs do not verify what is actually built, only what was approved by the Boston Transportation Department at the date of execution. There may be TAPAs in this dataset for developments that have changed over time, or have been redeveloped into something else. Developments under 50,000 square feet are not usually required to submit a TAPA.

Notice any missing TAPAs? Let us know about it by filling out this form

NOTE: This dataset is refreshed on a weekly basis.


Map of all known, executed Transportation Access Plan Agreements


Transportation Access Plan Agreement Process

Contact: Transportation

Transportation planners work very closely with developers to thoroughly evaluate a project's transportation impacts. They also propose plans that lessen those impacts.


  1. New Construction greater than or equal to 50,000 square feet
  2. Change in use for building greater than or equal to 50,000 square feet or greater than or equal to 100,000 square feet in Downtown
  3. Rehabilitation of an existing building greater than or equal to 100,000 square feet


The goal of the development review process is to prioritize safety, manage parking demand, and improve conditions for walking, biking, taking public transit.

Conversations to reduce transportation impacts can begin even before a developer officially starts the development review process. Negotiations continue throughout the entire development review process.

The TAPA formalizes the commitments the development team makes to reduce a project's impacts on our City's streets and transportation networks. 

Transportation Access Plan Agreement


Maximum Parking Ratios

The less parking we allow, the less congestion, the less traffic, and the less pollution we have.

Reducing parking in areas that are well-served by transit encourages people to take public transit. In this section, you can view the current maximum parking ratio guidelines for new large developments.

Space used for parking can instead be used for more housing, more parks, and more livable space. The guidelines are now updated to a more nuanced, parcel-based analysis. The new maximums better reflect the City's goal to reduce drive alone rates by 50% by 2030.

Maximum Parking Ratio Guidelines

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