You have to find out who is the entity bidding the project as this information is these days is usually readily available.
https://www.cityofchicago.org/city/en/depts/dps.html
What often happens in projects like this that have a long time between approval/design and bidding is the cost estimate is not updated, bids come in high, then either more funding needs to be found or design changes to reduce cost, and then a rebid.
Is this it? Lists a contract administrator contact
https://webapps1.cityofchicago.org/v...ction631519887