 He completely rebuilt the Paris sewers and installed miles of pipes to distribute gas for thousands of new streetlights along the Paris streets.Beginning in 1854, in the center of the city, Haussmann's workers tore down hundreds of old buildings and constructed new avenues to connect the central points of the city.Buildings along these avenues were required to be the same height, constructed in an architecturally similar style, and be faced with cream-coloured stone to create the signature look of Paris boulevards.