Gov. Andrew Cuomo signed off on granting the city another $300 million in bonding authority on Friday, providing a considerable bump in funds needed to construct affordable housing. With this latest allowance, the state has granted the city $771 million in tax exempt bond capacity this year — an amount Cuomo’s office touted as the highest provided in a decade. “Homelessness is exploding and affordable housing is all but disappearing,” Cuomo said in a statement.