Detroit State Savings Bank Owner Wants to Demolish Historic Structure, Build Parking

[DetroitPlanner]

We can settle this discussion. Find total office occupancy / 250 * 1.1. That's the number of spaces you need assuming no mass transit.

Not quite that simple:
ITE Rates are functions of type of development, and square footage, number of gas pumps, number of dwelling units, or other standard measurable things, usually produced in site plans. They are typically of the form OR . They do not consider location, competitors, complements, the cost of transportation, or many other obviously likely important factors. They are often estimated based on very few observations [[a non-statistically significant sample).
http://en.wikipedia.org/wiki/Trip_generation

http://en.wikibooks.org/wiki/Fundame...rip_Generation
http://www.ite.org/emodules/scriptco...cfm?pc=IR-016F

Of course then you need to apply modal splits.
http://en.wikipedia.org/wiki/Modal_share
http://www.icpsr.umich.edu/CrimeStat...Chapter.15.pdf

Note the modal split downtown will be skewed higher to transit because if various economic realities [[higher parking costs).