It's my understanding that the big castle like house referred to here was being built in phases so to speak. It could be that the buyer/owner has slowed construction down based on his/her/their financial flexibility.
In many subdivisions of this caliber, most everything is custom built so once a lot is sold, the house will be built based upon a schedule worked out by the builder and buyer. With retirement and stock funds down recently, it would make sense that these developments would be impacted.