Architectural plans submitted to the Pasadena Design Commission offer a first look at a new proposal to revamp a former Bank of America office building as offices for rent.

The five-story building, located at 101 S. Marengo Street, consists of approximately 315,000 square feet of rentable space above a more than 500-car parking garage.  Bank of America was the building's sole tenant from the time of its completion in 1974 until 2018, when it opted to not renew its lease.

Atlas Capital Group, which purchased property for $72 million earlier this year, has tapped Los Angeles-based architecture firm Rios to lead a planned remodel of the squat, windowless structure.

Building off of the boxy low-rise structure originally designed by architect Edward Durell Stone, the proposed renovation calls for carving windows and a central courtyard into monolithic building.  The courtyard, combined with the columns that support the building at the first floor, would allow for natural ventilation through the property.

Renderings also show improvements to existing access points to the property - including a stair case fronting Arroyo Seco Parkway - and new landscaping around the perimeter of the site.

An existing plaza fronting Green Street and Marengo Avenue would be maintained, according to architectural plans.

Atlas Capital Group, which is headquartered in New York, has also renovated historic buildings in Downtown Los Angeles, and is planning a 725-unit apartment complex in Chinatown.