A circa-2017 site plan shows renovations done over the past 3 years. These have added a new Saks store, West Wing (in gray) and "jewel box" retail building (in the northeast parking area). A reconfigured Lord & Taylor space used to be "Galleria V." Nowadays, a reconfigured Marshall Field's-Saks building is known as "Galleria V."  

The new (and relocated) Saks store encompasses 2 levels and 198,000 square feet.
Drawing from Saks, Incorporated

The old  Saks was repurposed as inline store and restaurant space. Tenants included Fig & Olive (Mediterranean cuisine), Coach, Nobu Houston and Kappa Toys. 
Drawing from www.simon.com / Simon Property Group