Situated on 628 acres (2.54 km²) three miles (5 km) north of downtown Lima, the hospital was constructed between 1908 and 1915. Built at a cost of $2.1 million, it was the largest poured-concrete structure in the country until superseded by the Pentagon. Its walls are at least 14 inches thick, with steel reinforcement going right down to bedrock.
: http://www.asylumprojects.org/index.php?title=Lima_State_Hospital

