300 South Riverside

300 South Riverside Plaza is a 1.1 million square foot, 23-story, LEED Gold Certified, Class A office tower located in Chicago’s West Loop. Sitting on the west bank of the Chicago River, 300 South Riverside Plaza has unimpeded views from all vantage points and unparalleled access to Union Station and Ogilvie Metra Trains. Built in 1987 and designed by the famous architectural firm, Skidmore, Owings & Merrill, this beautiful glass and steel building has a double cored 54,000 square foot floorplate, where a tenant can take one half of the floor and have the feel of a full floor tenant.

Third Millennium Group (Ownership) has recently redeveloped the building and set the standard for Class A office towers with the following tenant-only amenities: penthouse fitness center equipped with spa quality services such as steam showers, towel service, and complementary toiletries; penthouse conference center; a private riverfront patio; an outdoor winter plaza for company events; tenant lounge; a movie theater; and bicycle parking. Little Toasted in the lobby serves tenants for coffee, breakfast, lunch, happy hour, and dinner. Other amenities include Gateway Newsstand (sundry shop) and JP Morgan Chase Retail and ATMs. On top of the Building’s awarded LEED Gold Certification, Rooftop beehives sustain local flora and aid in honey bee research, and 100% of fresh air is changed  throughout each floor every 10 minutes.


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Year Built1983
Building Size23 Stories
1,048,357 Total Square Feet
AmenitiesConference center · Fitness center · On-Site retail establishments including Alonti Café and Tokyo Lunch Box & Sake Bar · New winter garden (all day lounge) · River lounge