Help modify a 3d print file to a better scale

Job ID: 34745512

Budget: $10 – $30 AUD

I am after some help with modifying a 3d print file... I purchased an stl map of Melbourne, Australia ,however, after printing it I realised that the height of the buildings, houses exct are far too small. I have been playing around with the z axis and scaling it that way but that scales everything up...