From the DCPL:
The DC Public Library has received preliminary design ideas for the historic renovation of the Martin Luther King Jr. Memorial Library.
Starting tomorrow, the design ideas will be displayed at the Martin Luther King Jr. Memorial Library, in neighborhood libraries and on the library’s website.
In addition, teams will present their design ideas and approach at a public meeting on Sat., Feb. 15.
In December, the Library selected Mecanoo/Martinez + Johnson Architecture; Patkau Architects/Ayers Saint Gross with Krueck +Sexton; and STUDIOS Architecture/The Freelon Group as the final three architect teams.
These finalists have developed two preliminary design ideas: one of a stand-alone library and one of a mixed-use building with additional floors. Both design ideas are intended to show each team’s vision and approach to renovating the central library.
No decisions have been made on the type or extent of the renovations or additions to the library.
Documents and Images
Design Ideas from Patkau Architects/Ayers Saint Gross with Krueck +Sexton (PDF; 65 MB)

One Image from Patkau Architects/Ayers Saint Gross with Krueck +Sexton Filing
Source: DC Public Library
Design Ideas from Martinez and Johnson + Mecanoo (PDF; 49 MB)
Design Ideas from STUDIOS Architecture/The Freelon Group (39.4MB)
Background and Additional Documents
DC Public Library Names Final Three Architect Teams for MLK Library (December 30, 2013)
10 Architecture Firms Shortlisted to Help Design NextGen MLK Jr. Library (October 18, 2013)
Search Begins for Architect to Design New DC Public Library Building (August 21, 2013)
NOTE: Includes full text of RFQ