The philanthropists Edythe and Eli Broad unveiled plans on Thursday in Los Angeles for the museum that will be named after them and house their substantial collection of contemporary art.

The three-story museum - to be designed by the firm Diller Scofidio + Renfro and called the Broad Art Foundation - will be near the Walt Disney Concert Hall and the Museum of Contemporary Art. It will feature almost an acre of column-free gallery space and a lecture hall for up to 200 people within its 120,000 square feet, and it will be wrapped with what the architects describe as a porous honeycomb ''veil,'' visible through a top-floor, sky-lit gallery.

Mr. Broad had considered at least two other sites for the museum, sparking a kind of civic competition last year among city officials for the tourism the museum would generate. But he ultimately decided to build it on Grand Street in downtown Los Angeles, whose redevelopment as a cultural hub Mr. Broad has long championed. In addition to paying for the building, the Broads will create a $200 million endowment for the museum, which - they made a point to note - will be larger than the combined endowments of the Los Angeles County Museum of Art and the Museum of Contemporary Art.
