The Prince George’s County Council voted unanimously Tuesday to reserve half of all taxes from gaming revenue generated by the billion-dollar MGM casino for public schools, libraries and community colleges.

Lawmakers introduced the measure in response to a proposal by County Executive Rushern L. Baker III (D) to raise property taxes by double-digits to generate new funding for schools. The council rejected the plan after a public outcry, raising taxes by a third of his original request.

The bill passed Tuesday would redirect 50 percent of the $42 million in revenue the casino is expected to generate once it opens in 2016 from the county’s general fund to its schools, library and community college budgets.

“This money should not supplant money that is already funding the schools, but supplement,” said council Chairman Mel Franklin (D-Upper Marlboro).

The legislation caps the amount of supplemental funding at $25 million. It is separate from the state’s Education Trust Fund, which provides money to school systems across Maryland by using revenue generated by slot machines at all casinos in the state.

The Prince George’s bill would not affect MGM funds that already have been designated by state law for rehabilitating Route 210 (Indian Head Highway) in southern Prince George’s or for local impact funds for the communities near the casino entertainment complex at National Harbor.

Lawmakers said that the bill was designed as a direct response to questions from citizens about whether the county could use taxes on gaming revenue as an alternative to the dramatic property tax increases Baker proposed.

“The budget process revealed to us that there is need for more trust,” Franklin said. “This bill is in large part to try to strengthen that trust, to show that we listened and we heard them when they said gaming revenue would mainly help education.”

The Baker administration did not take an official position on the legislation Tuesday. But spokesman Scott Peterson said the earmark would tie the county executive’s hands in deciding how best to use casino revenue.