Blindspot
Clem's Hotel
Clem calls Jane offering his help in the search for Avery in episode 3x10 “Balance of Might”.
London Hotel
Victor and Roman arrive in London where Blake is preparing for a fundraiser in episode 3x10 “Balance of Might”.
The Barclay Hotel is a 14-story luxury hotel constructed in 1926 for the Vanderbilt family by the New York Central Railroad on land recently freed up when the Grand Central Terminal tracks where moved underground. In 1978 the hotel was sold to Loews Hotels after the bankruptcy of its previous owners and underwent a massive renovation. The ground floor of the hotel hosts the flagship story of the perfumer Caswell-Massey which has occupied that space since the hotel opened.
Clem calls Jane offering his help in the search for Avery in episode 3x10 “Balance of Might”.
Victor and Roman arrive in London where Blake is preparing for a fundraiser in episode 3x10 “Balance of Might”.
Finch and Reese get jobs at the hotel so they can investigate their most recent number in episode 2x15 “Booked Solid”. Reese bring Hayden Price to the hotel to meet with his girlfriend in episode 3x07 “The Perfect Mark”.
Source: Person of Interest — Wikia
Reese and Shaw watch Hayden Price in his office with Finch in episode 3x07 “The Perfect Mark”.
Shaw and Reese follow Hayden Price into a restaurant under renovation and find him in the middle of a con in episode 3x07 “The Perfect Mark”.
Bull tracks Diana down to her new hotel and has to chase her through the lobby to tell her the proposal from his client to hers in episode 2x01 “School for Scandal”.
Source: IMDb