Construction work on a new multistory hotel at Ninth and New Hampshire streets could begin in November, and when it does, the plans may be slightly different from what the public last saw.

Doug Compton, who leads the group planning to build the new extended-stay Marriott at the southeast corner of Ninth and New Hampshire, said November is a likely time for construction work to begin on the project. He also said work to construct a seven-story apartment building on the northeast corner of the intersection could begin in March.

“It is going to get busy down there,” Compton said.

The development group also confirmed that it has altered its plans for the hotel building. The plans no longer include a rooftop restaurant, but none of the changes will affect the height or size of the building. The changes include:

• The top floor of the hotel now will house three condo units instead of the rooftop restaurant.

• The hotel building no longer will include any apartments, and as such, the number of hotel rooms will increase from 81 units to 92 units.

• The rooftop pool of the hotel will be moved to an enclosed area on the first floor.

• Since the main floor lobby no longer will need to accommodate an entrance to rooftop restaurant, the developers are proposing to expand the ground floor retail space by 400 square feet.

The letter also notes that the 121-unit, seven-story apartment building on the northeast corner is being designed with a rooftop pool to serve those residents.

Scott McCullough, director of planning and development services for the city, said the changes will not require the project to be reviewed by the city’s Historic Resources Commission again. Instead, the changes can be administratively approved as part of the city’s site plan process.

Before work can start on the northeast apartment building, however, the City Commission must rule on whether a requested roundabout for the Ninth and New Hampshire intersection should be allowed. The city hasn’t yet set a date to hear that issue.

When construction work begins on the two Ninth and New Hampshire buildings, it will mark one of the busier construction periods in downtown’s history. In addition to the new multistory buildings, work is expected to begin before the end of the year on the $19 million library and parking garage project at Seventh and Vermont streets.