Vent Building No. 5 is located above, and supported by the Interstate 90, South Boston Interchange tunnel structures. The building consists of four floors of structural steel and reinforced concrete construction, and it houses electrical equipment and ventilation fans for the I-90 tunnels.
- General Contractor: Walsh Construction Co.
- Contract Value: $31,097,900
- Notice to Proceed: April 14, 1999
- Contract Completion: May, 2002
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