Architectural Designs

What would be the estimated cost to build this house and are this add-ons architecturally possible?

http://www.houseplans.com/7100-square-feet-6-bedroom-7.5-bathroom-Luxury-home-plans-3-garage-(28860) I would like to add a basement with the following rooms to this house: 1.) Sitting area under the foyer 2.) Game room under the living room 3.) Indoor pool under the garage 4.) Home gym under the dining room 5.) Indoor basketball court under the family room/kitchen area My questions are as follows: 1. What would be the estimated cost to build this home with all of the things I would like to add if were built in the southern california area ( Los Angeles, San diego, Long Beach etc.) 2.) Is it possible to add the basement to begin with? Like will it be structurally stable?

Public Comments

1. There shouldn't be any problem adding a basement, the house has to be on some sort of foundation anyway, probably any qualified architect could design one, but it will likely cost as much or more for the custom design of the basement as for the stock plans for all of the rest of the house. I don't really know what current construction costs are, but I'd guess in the ball park of a million. In southern California I'd bet the piece of dirt you build it on will cost more than the house itself.