Owning This House Is My Ultimate Dream

I have dreamt about owning this house for a very long time. Its big, sits on two and a half acres, I became aware of this property in 2016 and I've tried to get in touch with the owner on several occasions. The current owner purchased this property in 2013 , I believe, and just sat on it and watched it rot. I'm not sure what he's planning on doing with it. It's previous owner was a member of the Saudi royal family. He purchased it in the late eighties and didn't finish building it. Renovating this would be a mission because it's basically an empty rotting shell. The ceiling has caved in some rooms, the floorboards have rotted, the roof leaks, the stairs have plants growing, rats are running everywhere, the indoor swimming pool sometimes fills up with rain water and there's damage everywhere. It's a mess. My rough guess is it'd cost at least £10 million to renovate this mansion. The exterior needs a lot of work but the inside needs a compl