WASHINGTON — Many places claim to have “one of the best views in Washington,” but the tallest current perch for viewing is set to open to the public next month.

The Observation Deck At CEB Tower, developer JBG’s newest office building in Rosslyn, will officially open its observation deck June 21, a fitting day for long-distance viewing: the Summer Solstice and longest day of the year.

The observation deck at CEB Tower, named after its primary tenant, the Corporate Executive Board, is on the 31st floor of the tallest building inside the Beltway and has 360-degree views of D.C., Maryland and Virginia.

(The Washington Monument is taller, but it is also currently closed to visitors.)

The Observation Deck includes 12,000 square feet of observation space, an open-air terrace, a cafe and a private event space.

It is operated by Legends, the same company that operates One World Observatory at the World Trade Center in New York and OUE Skyspace in Los Angeles.

Access to the observation deck is not free. Adult tickets are $21 when purchased online, and $22 on-site. There are discounts for youth, students, military and seniors.

It includes an interactive exhibit called “Windows Into History” that uses interactive digital touch-screen displays and directional audio narrating some of the viewpoints visitors can see that have influenced our nation’s history. There is also what Legends calls an interactive hologram experience, that allows guests to step into the shoes of selected historical figures.

Tickets are sold as advanced reservations with timed ticketing to manage capacity. Tickets are available online now.