Over the next few years, the President and Congress established several new agencies to supervise the approval, design, and construction of new buildings in the District of Columbia: The Commission of Fine Arts in 1910 (to approve the design of new structures), the Public Buildings Commission in 1916 (to make recommendations regarding the housing of federal agencies and offices), and the National Capital Parks and Planning Commission in 1924 (to oversee planning for the District). In the mid-1910s, Congress appropriated and the government spent $7 million to acquire land on Pennsylvania Avenue NW between 14th and 15th Streets NW and several blocks south. But no demolition or construction was conducted, and the government merely collected rent from tenants in the area. In 1924, the Public Buildings Commission recommended that a new series of federal office buildings be built near the White House. The effort saw success in 1926 with the passage by the United States Congress of the Public Buildings Act, which authorized the construction of the Federal Triangle complex of buildings as well as a new U.S. Supreme Court building opposite the United States Capitol, a major extension of the U.S. Government Printing Office building on North Capitol Street, and significant widening of B Street NW on the north side of the National Mall (eventually renamed Constitution Avenue). The construction of Federal Triangle enabled the Pennsylvania Avenue National Historic Site to become the "monumental core" of the city.