David Tang practises municipal, land development, and planning law. He also represents many charities and not-for-profit organizations and is the Chair of the Nonprofit Organizations Committee of the American Bar Association.

David appears regularly before the Local Planning Appeal Tribunal, the Assessment Review Board, and the courts to obtain court and planning decisions from official plan amendments and zoning amendments to subdivision approval and severances. He deals regularly with provincial and municipal governments, representing developers, businesses, landowners, and municipalities. David often assists landowners and businesses to protect their investments and processes. He advises on property tax matters, both proactively for business-planning purposes and on appeals. David has particular expertise in working with not-for-profit groups who are seeking to redevelop their land, especially in the affordable or subsidized housing area.