A massive expansion of the Boston Convention and Exhibition Center would likely entail the acquisition of South Boston parcels owned by the US Postal Service and the Massachusetts Port Authority, according to a development framework the state’s Convention Center Authority released Monday.

The framework calls for the development of a new 1,000-room hotel along the South Boston waterfront, as well as the construction of a 75,000-square foot-ballroom, a 5,000-seat auditorium, and upwards of 500,000 square feet of new exhibit and meeting space.

Such a program would approximately double the space the South Boston convention center has in play. However, the convention center’s decade-old authorizing legislation only left the 40-acre convention center with 22 open acres to expand into. So the development plan – prepared by Watertown firm Sasaki Associates – envisions the creation of a new "campus" that puts in play a Massport-owned lot between Summer Street, D Street and Congress Street, and a set of USPS lots along West Service Road. The report also discusses long-term expansion to the east of D Street.

At a press conference this morning, the convention center authority’s executive director, James Rooney, announced a year-long expansion planning dialogue with city, state and business stakeholders. He said the 516,000-square-foot South Boston hall had lost 72 shows in the past year because the building is either too small or lacked enough hotel rooms within a half-mile radius. He pegged the lost shows’ economic impact at $336 million.

"We can’t afford to leave that kind of money on the table," Rooney said. He set the goal of placing Boston in the top five of North American convention destinations, arguing, "A do-nothing strategy is just another way of going backwards."

State Rep. Brian Wallace, D-South Boston, predicted an aggressive expansion program at the convention center could spur a wave of private development on several acres of adjacent parking lots. "John Hynes, John Drew and Joe Fallon are going to build here," he said. "This could be the catalyst for all that."

Rooney declined to put a price tag on any expansion, or to identify a funding mechanism for the expansion. Two years of bitter legislative infighting preceded the state bond issuance that helped fund the $800 million South Boston facility a decade ago.