Massive un-built mansion sussesx

This mansion is 180 meters long that is twice the length of updown court in Surrey, buckingham palace is only 100m!!! Un-built for a reason i think?. It is being cladd in portland cast stone which i believe is quite rare for a new build.

https://i.servimg.com/u/f82/13/72/84/13/33144912.jpg
https://i.servimg.com/u/f82/13/72/84/13/33144913.jpg
https://i.servimg.com/u/f82/13/72/84/13/33144914.jpg
https://i.servimg.com/u/f82/13/72/84/13/45050211.jpg

Looks positively magnificent except for one pet peave... I wonder why the upper floors only span the very center of such a wide mansion...? Surely there's use for more space on the second and third story floors?

I love the domed ceiling, the stone construction, and that copper colored facade on the dome roof in the center. Brilliant. Classic. Timeless. Palatial beauty.

You wouldn't happen to have the floorplans for this property, would you?

sorry i dont, i wish i did though. I know what you mean about the height. Apparantly the wings to both sides contain rooms built for display art and antiques hence the reason why there are not many windows.