Construction is starting this week on a $23 million renovation of the Baton Rouge Marriott that will involve expanding all the hotel’s 299 rooms.

Plans are to take in the balconies to give more space to the hotel rooms and to expand the guest bathrooms, said Jamie Turnage, director of sales for the Baton Rouge Marriott. Work should be complete by late September.

The Marriott won’t be closed while the renovations are going on. “We’re going to close floors and have a buffer in between,” Turnage said.

The hotel ballroom will be closed for a few months, beginning in July, so it can be remodeled. Renovations also will be done to the lobby, restaurant and exterior.

AVR Realty Co., an investment company based in Yonkers, New York, and Dimension Development Co., a Natchitoches-based hotel management firm, bought the Baton Rouge Marriott in April for $21.8 million and announced plans to make extensive renovations to the hotel. The hotel, which is just off Interstate 10 near College Drive and Corporate Boulevard, has been in business since 1976, first as a Hilton. The hotel switched flags in 2000, becoming a Marriott.

Dimension Development is serving as general contractor for the renovations.