How can we fix our cash-flow problem?
Not to be too short, but if your financing plan is as sound as your construction plan, that is probably where you are running into trouble. In every project I've ever seen, construction costs always need allowances. Not adjusting for this causes problems--as you are experiencing right now. However, with your track record, you may be able to work with your suppliers on the vendor side to get some cash-flow accommodation, especially if you can't do it on the contractor side. That said, I'd also look for some accommodation on the contractor side. Anything you can do for outflow will give you some space to get creative on inflow.
On the revenue side, you need to find ways to increase sales. Do you have a database of past or current customers you can tap into? If you are near the university, can you sponsor a fundraiser or one-off event and take part of the proceeds? Can you raise prices or increase profit margins? Just be careful about cutting costs and, whatever you do, don't discount, because you are taking additional dollars off your bottom line.
Given your revenue numbers and time in business, you should have a number of options available to you--it's just a matter of looking again at how you are going about those options, and going directly to the people you’re working with to negotiate more favorable terms.
All the best.