Three firms have expressed interest in the plan to extend Constitution Boulevard West — with bids coming in between $4.5 million and nearly $10 million, according to Mayor Mark Lauretti. Lauretti would not identify the three firms interested in the Mas property, saying only that two are Connecticut based. In the end, Lauretti said these companies could bring some 400 to 500 jobs to the city. According to the mayor, state leadership has agreed to cover $5 million. The Inland Wetlands Commission, at its meeting last month, approved the city’s permit application for extension of the roadway, with street construction occurring within regulated wetlands areas. Lauretti has stated that one major manufacturer — whose name he would not give because negotiations are ongoing — is seeking a 270,000-square-foot building on the property. The 70-acre parcel — known as the Mas property — sits near Bridgeport Avenue, and the roadway plans include extending Constitution Boulevard to reach Shelton Avenue/Route 108. Lauretti stated that a zone change would be needed, requiring plans to go before the Planning and Zoning Commission at some point.