Officials approved on Thursday a proposal for a controversial billion-dollar arena at Belmont Park that would become the New York Islanders next home — paving the way for construction to begin, a report said.

The $1.3 billion proposal for a 19,000-seat arena and a 250-room hotel got the green light from all six board members of the Empire State Development Corporation after a meeting in Manhattan, Newsday reported.

The development will fill 43 acres of state-owned property at Belmont Park, according to the report.

The owners of the Islanders, the Mets and a private development company will build the stadium.

“We are proud of the open, public process this project has gone through over the last two years, strengthened by the input and support of community members who made their voices heard and helped improve the plan, resulting in today’s positive outcome,” board chairman Howard Zemsky said after the approval, according to Newsday.

The new arena is slated to open by 2021.