Mayor Antonio Villaraigosa issued a rare veto Monday, overriding an ordinance passed by the City Council that would allow developers to buy the unused airspace over the Los Angeles Convention Center to construct taller buildings downtown. Villaraigosa’s office said he supports the ordinance’s concept, which allows greater density and raises money from the sale of the convention center’s air rights to build parks, affordable housing and other downtown amenities. But it does not allow him to veto individual projects. In his veto letter, Villaraigosa asks the council to rewrite the ordinance and give him override authority. Downtown boosters have said the ordinance will focus more high-occupancy buildings downtown near public transit and help provide the amenities for a growing residential community. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! But some planning experts have questioned whether the infrastructure can support more dense development.