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Another prominent downtown office building is getting a snazzy new lobby, this one passed every day by thousands of commuters coming from and going to South Station.

The owners of Fiduciary Trust’s dark and blocky former home at 175 Federal St., overlooking Dewey Square, filed plans with the city Monday to remake the ground floor into a glass-wrapped three-story lobby. The project would transform one of the more distinctive buildings in the Financial District — 175 Federal starts with a small base before flaring out on its upper floors to fill most of the small city block on which it sits — into one with a bright front door facing South Station and the Rose Fitzgerald Kennedy Greenway and a pedestrian deck on Federal Street.

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“The objective of this project is to better integrate this iconic building with downtown Boston,” said Gabriele Gottschalk, senior project manager of construction and development at Deka Immobilien, the German investment firm that owns the building. “Boston, and the Financial District, in particular, have gone through tremendous growth and change since 175 Federal’s initial construction.”

If the changes are approved by the Boston Planning & Development Agency, 175 Federal would be the latest in a string of downtown buildings to undergo dramatic lobby upgrades. From the striking new atrium at 100 Federal St. to a new entrance at 99 High St. to upgraded amenities at 225 Franklin St., the owners of older towers all over downtown are investing in their ground levels to help draw higher-paying tenants to the office space upstairs.

Also, 175 Federal is one of several buildings built before the Big Dig that are repositioning their front entrances to face the Greenway.

The project would add 12,000 square feet of retail and restaurant space to the lower three floors of the 17-story tower.

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Tim Logan can be reached at timothy.logan@globe.com. Follow him on Twitter at @bytimlogan.