Phase 1 ended up costing $500 million over its original budget of $3.8 billion—still a very high price compared to other new subway systems worldwide. Regulations set by the Buy America Act forced the MTA to purchase materials made in the United States, which led to objections when an MTA contractor bought a fire suppression system made in Finland. Finally, the private and public sector could not cooperate smoothly on the project, further raising costs. Of the $4.5 billion cost for Phase 1, $2.4 billion was allocated to building the three new stations and renovating the Lexington Avenue–63rd Street station. Meanwhile, $500 million was spent on design and engineering, and another $734 million was for building tunnels between the stations, tracks, signals, and trackside systems. The rest of the cost, $800 million, was spent on "construction management, real estate, station artwork, fare-collection systems and other sundry items." The stations' cost was magnified by the depth of the stations and the enormity of the caverns that needed to be excavated. The Second Avenue Subway stations have full-length mezzanines, like the original IND but unlike other deep-level projects such as London's Crossrail. The stations will have full-length mezzanines as opposed to smaller mezzanines for each entrance to accommodate anticipated ridership for the full-length line and to comply with emergency egress requirements.