The Dallas Museum of Art had a big day Tuesday, getting donations worth as much as $400 million: three extensive art collections, a $25 million Monet, $32 million of endowment funds for acquisitions and a really nice house on Preston Road. The stash of 800 works dating from the 1940s to the present includes giants such as Jasper Johns, Richard Serra, Willem de Kooning and Gerhard Richter. It’s the largest combined gift in the museum’s history and one of the nation’s biggest ever.”