McCownGordon Construction headquarters

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McCownGordon plans to spend $10.5 million to renovate 850 Main for its new headquarters. (Rendering by Helix)

850 Main St. |

45,000 square feet office space |

Cost: $10.5 million |

Architect: Helix Architecture + Design |

General Contractor: McCownGordon Construction |

Completion: 2018