ROCKLAND, Maine — A five-story boutique hotel that has been years in the making will be opening on May 1.

The facility — 250 Main Hotel — features 26 rooms overlooking Rockland Harbor and downtown Rockland. Built at an estimated cost of $2.9 million, the tallest building in the city will employ a staff of 20 year-round and likely more during the peak months of July and August.

Jesse Henry of the Migis Hotel Group said that the owners, the Lyman family, had a couple of design requirements, including that the atmosphere be casual.

Guests will notice when they walk into the lobby that there is no classic front desk counter. Instead, guests will be met by a staff member who will check them in using an electronic tablet.

When guests get to their floor either by elevator or the stairs, they won’t find a hallway. Instead, they will find an open “gallery.” Artwork will adorn these open spaces on each floor.

The hotel is stressing and will be promoting its location downtown close to art galleries, museums, restaurants and the harbor. There will be daily wine social hours, and guests will be able to enjoy the view from the rooftop, 57 feet above Main Street.

Cabot and Heidi Lyman of Lyman Morse Boatbuilding in Thomaston used the talents of his employees from the boatyard, including welders, plumbers and electricians to construct the hotel.

Ruth Woodbury, guests services manager, said the nautical flavor is evident in the hotel. Light fixtures in the stairways are the same as ones used aboard yachts. A sextant sits atop a table in the Main Street level lobby and a frame of a boat is affixed to the wall above a gas fireplace in the lobby.

“There’s not the typical sea shells and anchors,” she said.

The hotel also was designed to be economically friendly with energy efficient lights and water saving toilets. The washing machines for staff to do laundry are so high efficiency that it takes nine minutes to do a load, said Stephanie Stone, the head of housekeeping.

The Migis Hotel Group, a Maine-based management company, will manage the hotel for the Lymans. The group runs other lodging places such as The Inn at Ocean’s Edge in Lincolnville, the Migis Lodge in South Casco along Sebago Lake, and the Black Point Inn in Scarborough.

Taylor Corson, the hotel manager, comes to 250 Main Hotel after 2½ years with the Westin Portland Harborview. Corson began her career in hospitality as a server with the Migis group in 1998.

Corson said 250 Main Hotel already has received tons of reservations.

The construction of the hotel, approved in June 2014, is one of a series of projects at or near completion in the downtown. The Center for Maine Contemporary Art will be opening in June.