1)
The cost of planning becomes minimized. For instance, the cost shall be reduced by 3%~5%, as Nakano already has the resources.
2)
If one company shall manage both the design and the construction, the extent of the responsibility shall be clear. Consequently, the company is able to prevent large expenditures not provided for in the budget.
3)
Plan changes will be quickly incorporated, preventing waste of time and materials. With direct interaction between owner and contractor unnecessary intermedaitory wastage is eliminated.
4)
Reduction of unnecessary costs through the use of one entity.