State officials want to start construction on a pair of midpriced hotels across from the Boston Convention & Exhibition Center this year, and follow in 2014 with a larger 1,000-room hotel on one of two sites off Summer Street.

The timetable was laid out Monday night during a public hearing on the Massachusetts Convention Center Authority’s plans to expand the massive convention complex. The authority’s director of capital projects, Howard Davis, said the hotel rooms are badly needed to support the South Boston hall and that officials must take steps to get them developed.