The regular block that Cerdà put forward, as the supporting element of the buildings, was a square, 113-metre-wide block, with a 19.8 m chamfer. The intervention was carried out following complex, detailed and concise reasoning, whereby he introduced variables like the surface of the plot of land, the height of the building, density, etc. After obtaining eight possible main sizes and eight small variants, he finally chose the 113.28-metre-wide block. However, as you would expect of any good technician, he omits the decimal points and is left with the 113 metres used in the project.
Miquel Corominas and Joel Bages, ‘The Morphological Base of the Block’, in Joan Busquets and Miquel Corominas (dirs/eds), Cerda and the Barcelona of the Future: Reality Versus Project (Barcelona: Diputacio de Barcelona and Centre de Cultura Contemporania de Barcelona, 2009), p. 74.