Following up on my post Saturday, the Syndicate Trust Building, occupied the other half of the block with the Century Building and was completed in 1907. The 16-story building was developed by the Syndicate Trust Company as an annex to the Century, which it acquired in 1902. Scruggs Vandervoort Barney department store moved to the lower floors of new Syndicate Building in 1907 (correction from Saturday's post), and presumably occupied the lower floors of the Century as well. In 1912, additional floors were added to the connection and the store expanded to seven floors, but eventually grew to 10 floors before closing in 1967.
The second image is the proposal that was put forward by developer Craig Heller, to preserve the Century Building and rehabilitate the entire block. The basement and lower floors would have been converted to 700 parking spaces with loft apartments and condos on the upper floors. At the time the City of St. Louis owned the entire block, but the Mayor's office and the developers of the Old Post Office rehab project quashed this plan in favor of demolishing the Century for a new 1000 car parking garage.
After the Century was demolished and the garage built, the Syndicate, which itself was previously thisclose to being demolished by a former owner (See Built St. Louis for this long story -link: @arch_ex profile page), was rehabbed into loft condos and apartments, including some reserved for artists with gallery and studio space. The rehab included conversion of the basement, 2nd, and 3rd floors to fulfill most of the building's parking needs, thus with very little reliance on the Garage Mahol next door. Last two images: circa 1910 from the University City Library collection and a Vandervoort’s postcard from the Department Store Museum blog.