[KevinFromTexas]

I believe this was a project description presented to the City of Austin by the developer.

http://downtownaustinblog.org/2009/1...-walk-concept/

The Shoal Creek Walk, a proposed development project from Schlosser Development, will be a true mixed-use building complex located at the corner of West Sixth and Bowie Streets in downtown Austin, Texas. The project will closely conform to the constraints of the site which include a capital view corridor over approximately one half of the property and the Shoal Creek floodplain elevation.

These site limitations create a specific and very limited area where building improvements can be made on the site, by restricting both the building height and the overall footprint of any buildings on the site. Within those limitations, two buildings will be situated along Bowie Street, as the eastern portion of the site is within the floodplain. The high-rise building, at 350′ tall, will be located on the north portion of the property with a total of approximately 490,000 sq. ft. of office, retail and residential uses. The low-rise building will be situated at the corner of West Fifth and Bowie Streets, with primarily offices above the first level retail component for a total of about 100,000 sq. ft.

The two buildings together will provide more than 450,000 sq. ft. of office space, which is of a size able to attract a major employer and will likely be built in phases, to allow accommodation of a variety of tenant sizes. This flexibility will greatly enhance the feasibility of the project moving forward. The larger building will also have a residential component of about 90 units located above the office in what will be a narrower, residential footprint.