BOSTON -- The Big Dig is marking another milestone as the Legislature is being asked for final approval to turn the land over the construction project into a giant park project.

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Watch Pam Cross' Report Go Beyond The Big Dig With Chronicle

NewsCenter 5's Pam Cross reported that the Rose Kennedy Greenway will transform central Boston once the project is completed, replacing the green steel Central Artery with new land waiting to be developed.

"Rarely do cities, particularly older cities, have such an opportunity to transform themselves," acting Gov. Jane Swift said.

A trust to be created by the Legislature will oversee the project, about 75 percent to be open space, 25 percent development.

"We have a chance to create a distinctive, welcoming space that works for business and Bostonians alike," Mayor Thomas M. Menino said.

Key areas will include new housing and parks in the North End, reconnecting the wharfs with downtown, a botanical garden near South Station and for Chinatown, new parks and housing.

Funds come from the Massachusetts Turnpike Authority and private developers. It's designed to be self-supporting in years to come, but some worry about that future.

"Will we only have wonderful amenities where private developers support it?" asked Shirley Kressel of the Alliance for Boston Neighborhoods. "What does this mean as a trend for the future of public space in the city?"

The project is on a fast track, as city officials want the greenway ready when the Big Dig is done.

House Speaker Thomas Finneran said that he's sure the Legislature will approve the park plan before it adjourns for the summer recess July 31.