SAN FRANCISCO -- San Francisco voters will consider three local propositions Tuesday addressing aging park facilities, a shortage of police officers, and a proposal to convert Alcatraz Island into a global center for peace.

Proposition A is a bond measure that would authorize the city to borrow $185 million for construction, rebuilding and improvements to park and recreation facilities.

Proponents argue the money is needed to repair or replace deteriorating facilities, and to make safety and aesthetic improvements and earthquake retrofits, and that there would be no increase in property taxes to repay the bonds.

The bond funds would be divided into $117.4 million for 12 neighborhood parks and $33.5 million for potential projects at nine waterfront parks. The remainder would be allocated for park restrooms, athletic fields, nature trails, forestry and other park and recreation projects.

Proposition A, endorsed by the San Francisco Board of Supervisors, requires a two-thirds majority to for passage.

Proposition B would allow certain San Francisco police officers eligible for retirement benefits to continue working for up to three years while accruing retirement benefits in tax-deferred retirement accounts.

Supporters of the proposition say the program would help San Francisco's shortage of police officers by allowing the department to retain experienced officers, particularly in the neighborhood patrol and investigation units. They claim the program would be cost-neutral to the city.

Proposition B requires more than 50 percent of votes for passage.

Proposition C would enact a nonbinding city policy that San Francisco "should explore and facilitate the acquisition of Alcatraz Island from the United States government to transform it into a Global Peace Center." The island is part of the Golden Gate National Recreation Area and is maintained by the National Park Service.

The Global Peace Foundation, proponents of the proposition, want to remove the island's main prison block and build in its place an international center for nonviolent conflict resolution, accompanied by several multimedia centers and "an architecturally advanced sacred, healing environment."

The San Francisco Republican Party, which opposes the proposition, argues its proponents have dubious beliefs and that San Francisco taxpayers would have to assume the cost of maintaining and operating Alcatraz.

Proposition C requires more than 50 percent of votes for passage.