in 1963. The remaining structures are only proposals. for which cost 
estimates have been made. The costs for the Toronto Floating Airport 
varied from $35 per square foot to " a pessimistic $4,356,000 per 
acre. . .'' (100 dollars per square foot) by the Canadian Department of 
Transport; the differences arise over the estimated costs of solving 
difficult anchorage and structural problems peculiar to the chosen site. 
The comparatively high cost of MOBS is due to the more severe design 
loads imposed by the ocean environment, combined with the more conservative 
unit cost of structural concrete. 
Table 5.5. Selected Unit Area Costs of Single-Level 
Floating Concrete Structures 
Dollars/sq ft 
FLATR:2/ (a) Large area $ 29.40 
(b) Small area 33.40 
Rutgers euearene2) (Pancoua! estimate) 100.00 
Lake Washington Floating prideee! 25.70 
Parsons' Floating Pontoon Neeser 30.10 
. e/ 
Toronto Floating Airport:— 
(a) Originator's estimate 35.40 
(b) Canadian Department of Transport estimate 100.00 
MOBS, single-deck semi-submersible, (300' x 300') 59.00 
a/ 
Weidlinger, 1970 
b/ 
Ralph M. Parsons Co., 1969 
cf 
Ibid., p. 102 
d/ 
Ibid 
e/ 
City cost indexes are commonly applied to construction cost estimates 
to account for variations between locations. From recently published 
figures* it does not appear likely the total costs given in Tables Dae) 
* Building Construction Cost Data 1970, 28th Annual Edition, R. S. Means, 
Co., Doxbury, Mass. 
