If all goes well, an enlarged convention center will bring more than meetings and trade shows to Philadelphia, city officials said this week. According to the Philadelphia Inquirer, it will also bring a smattering of new hotels, restaurants and other developments to downtown areas.The first phase of construction will begin this summer on a $700 million expansion to the Pennsylvania Convention Center that includes a 376,000-square-foot addition. When that's complete in January 2011, the center will include 1 million square feet of saleable space and 541,000 square feet of contiguous exhibit space -- the largest in the Northeast.Still, it's the development outside of the convention center that has the city buzzing, as the expansion could initiate construction on up to 2,600 Center City hotel rooms, not to mention several shops and outdoor cafes. The Pennsylvania Academy of Fine Arts is getting in on the action, too, and has proposed a pedestrian walkway that connects the convention center to Philadelphia's famed museum mile on Benjamin Franklin Parkway. It will include an outdoor plaza with shops, a restaurant and more.Already, three new hotels are under construction near the Pennsylvania Convention Center. Scheduled to open next year, they include a 202-room Le Meridien, the 235-room Hotel Palomar and a 95-room Four Points by Sheraton. Also planned, but not yet started, are a 268-room Intercontinental Hotel and a 275-room W Hotel, as well as two other properties that promise to deliver a combined 800 rooms.