Architecture Puzzler #145

Guess which one of these statements concerning the construction of Richard Meier's J.P. Getty Center in Los Angles is false?

a. 240 subcontractors were involved.
b. 260,000 cubic yards (200,000 cubic meters) of concrete were poured.
c. 7,500 gallons (28,000 liters) of silicon sealant were used for curtain walls and waterproofing.
d. 1.2 million square feet (111,484 square meters) of stone were used.

(Hint: the correct answer is twice what is indicated above.)

Efflorescence can cause spalling. True or false?