A summary of selected City Hall actions this past week affecting central Los Angeles.

CITY COUNCIL

* CRENSHAW CRUISING BAN: Approved a motion to close a four-mile stretch of Crenshaw Boulevard on Sunday nights to deter automobile cruising. Crenshaw will be closed from Adams Boulevard to Jefferson Boulevard from 10 p.m. to midnight, and from Jefferson Boulevard to the Inglewood city limits at 79th Street from 9 p.m. to midnight. The action was recommended by the Crenshaw Boulevard Community Task Force, a group of local residents and business people who have complained that Sunday night cruisers create gridlock, noise pollution and littering. MTA buses, emergency vehicles, patrons of local businesses and local residents will be allowed access to the boulevard.

* SPEED LIMIT INCREASE: Approved an ordinance increasing the speed limit to 40 m.p.h. from 35 m.p.h. along Washington Boulevard between Genesee Avenue on the west, which is near Fairfax Avenue, and the eastern city limit near Grande Vista Avenue.

* LOW-INCOME HOUSING: Authorized the city Housing Department to accept a $3.6-million loan to Dunbar Economic Development Corp., a community-based organization, to build Somerville Place, a 41-unit housing development in the 4200 block of South Central Avenue. The plan also calls for transforming the Golden State Mutual office building, a landmark structure designed by African American architect James Garrott in 1929, into a day-care center. Most of the housing units will be built on an adjacent lot. Construction is expected to begin in August and be completed next May.

* SENIORS HOUSING: Authorized the Housing Department to execute a $1.2-million loan to Normandie Nonprofit Housing Inc. to develop Normandie Senior Housing, a 73-unit low-income housing project for seniors. Construction is planned to begin next spring, with a completion goal of June, 1996.

* BLOCK PARTY: Approved the temporary street closure of 60th Street between Figueroa Street and Grand Avenue on Saturday from 11 a.m. to 8 p.m. for the annual 60th Street Block Club party.

HOW THEY VOTED

How South-Central and Eastside City Council representatives voted on selected issues. * SHUT-OFF VALVES: Instructed the city attorney to prepare an ordinance, effective July 1, 1995, that will require all new construction of residential, commercial, industrial and government buildings to install valves that will automatically shut off main gas lines during an earthquake. The valves could cost homeowners up to $300 for purchase and installation. Passed 12-3. Voting yes: Richard Alatorre, Mike Hernandez, Mark Ridley-Thomas, Nate Holden, Jackie Goldberg. Voting no: Rudy Svorinich Jr., Rita Walters.