A 2015 University of California study on the relationship between active cities (with a lot of walking, cycling and public transport) and economic prosperity shows very clear findings based on ‘strong’ evidence that active cities are good for business. Well worth a good look.

This was "meta-research", in which they looked at the lots of different studies to get a much more accurate overview of what they show in combination.

The link above goes to a popular summary. There is also a document with more words and fewer pictures.  

Pages 14 to 17 deal specifically with Urban Design and Transport issues and are full of good things to quote. The matrix tables are explained on the methodology tables on pp 7 – 10.