It is not known who designed the new theatre building, though tradition ascribes it to Sir Christopher Wren. This however seems unlikely on both practical and stylistic grounds. Perhaps Robert Hooke, an associate of Wren's had something to do with the design. The outside measurements were 147–148’ by 57’, including a 10’ deep porch. A foreign visitor reported in 1676 that it contained a central "pit", in the form of an amphitheatre, two tiers of seven boxes each holding twenty people, and an upper gallery. It could accommodate approximately 850 patrons. The theatre represented a great investment to the Duke's Company. The interior was richly decorated: the proscenium arch had carvings by Grinling Gibbons.