AccuCities - http://www.accucities.com/
AccuCities is organised in 0.25 km² tiles. This allows for easy and efficient use of the 3D models as users only load and work on clearly defined sections of the dataset. Data organised in this way is also ideal for 3D printing and applications allowing for data overlays as our tile system corresponds to the O.S. national grid.
Get more info & download the 500 x 500 meters free sample from this video at
