Literary Treasure Hunt: Clue #5

To find this fifth copy of Thrones, solve the clue and be the first to visit the site and claim the prize.  Good luck!

Established in 1856, Washington's oldest and most historic saloon was a favorite of Presidents Grant, Cleveland, Harding and Theodore Roosevelt. Although not in its original location, this popular meeting spot opened at its current address in 1983 and is stall a favorite of political insiders, journalists, celebrities and theater-goers. Finding this book at this site could be a "bear."