I thought this one was interesting ...

http://property.timesonline.co.uk/tol/life_and_style/property/buying_and_selling\
/article2030717.ece

An AG slate sculpture as part of a London development of flats /
apartments for the super-wealthy (last flat still unsold at about
£7.5m, apparently). It's not completely clear (to me) if the sculpture
is accessible to the public or not ...

Regards,

Brian