Building
A building, or edifice, is a structure with a roof and walls standing more or less permanently in one place, such as a house or factory. Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, land prices, ground conditions, specific uses, and aesthetic reasons. To better understand the term building compare the list of nonbuilding structures.
Workshop
Beginning with the Industrial Revolution era, a workshop may be a room, rooms or building which provides both the area and tools (or machinery) that may be required for the manufacture or repair of manufactured goods. Workshops were the only places of production until the advent of industrialization and the development of larger factories. In the 20th and 21st century, many Western homes contain a workshop in the garage, basement, or an external shed. Home workshops typically contain a workbench, hand tools, power tools and other hardware. Along with their practical applications for repair goods or do small manufacturing runs, workshops are used to tinker and make prototypes.
Building
I knew, as everyone knows, that the easiest way to attract a crowd is to let it be known that at a given time and a given place some one is going to attempt something that in the event of failure will mean sudden death. That's what attracts us to the man who paints the flagstaff on the tall building, or to the 'human fly' who scales the walls of the same building.
Harry Houdini As quoted in The Life and Many Deaths of Harry Houdini (1993) by Ruth Brandon, p. 153
Building
I do not believe that ever any building was truly great, unless it had mighty masses, vigorous and deep, of shadow mingled with its surface.
John Ruskin, The Seven Lamps of Architecture (1849), chapter III, paragraph 24.