Fairfax County allows building-by-building stabilization for multi-phase projects in new TDM rules

Jul 23, 2026

Under revised TDM guidance, multi-building developments can now enter the applicant control period on a per-building basis if a building is one year post-buildout, reaches 85% occupancy, and records three consecutive qualifying trip counts.

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Fairfax County planners described a key change for multi-phase developments under the updated TDM guidelines: buildings can enter the applicant control period individually rather than waiting for an entire multi-building site to be fully built out.

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