This is 231-243 Baker Street in London.
In the middle is the fictional 221b Baker Street home of Sherlock Holmes - now a museum.
This is the exterior of The Sherlock Holmes Museum - 221b Baker Street. Including the shop.
You buy your tickets (that leaflet) in the shop, then the "Policeman" lets you in to Sherlock's home.
TQ 2782 SE CITY OF WESTMINSTER BAKER STREET, NW1
34/45 (West side)
6.4.82 Nos. 231 to 243 (odd)
Terraced houses with shops. c.1815 Portman Estate development. Stock
brick with stuccoed ground floors; concealed slate roofs. 4 storeys.
2-window wide fronts. House doorways to left, Nos. 231 and 233
semicircular arched with panelled doors and radial patterned fanlights,
the rest square headed with fanlights. Mid to later C.19 shop fronts with
C.20 alterations. Upper floors have recessed glazing bar sashes under
flat gauged red brick arches except for No. 241 with stucco architraves.
Stucco frieze and crowning cornice with blocking course. Some original
cast iron window guards and Nos. 237 and 239 with bracketed original cast
Lanterns above the door to Sherlock's home.