BOSTON — A Boston real estate developer is proposing to transform a cluster of office buildings near Faneuil Hall into a vibrant commercial complex featuring restaurants, retail and hotel space.

Related Beal’s proposal for Congress Square calls for adding 50,000-plus square feet of restaurant and retail space to the ground floors of five buildings.

The plan calls for turning a little-used alley into a pedestrian zone lined with cafes and shops connecting with Faneuil Hall, Post Office Square and Downtown Crossing.

Related bought 343,000 square feet of primarily office space from Fidelity Investments in December for $87.25 million. Fidelity will move out of three of the buildings by year’s end and the others by the end of October 2015.

“Our plan is to rejuvenate the entire block through a mixed-use redevelopment strategy,” said Stephen Faber, executive vice president of Related Beal. “These buildings and this location present us with the opportunity to …. create a real destination.”

Transforming Quaker Lane is the centerpiece of the project.

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