I'm very sorry to hear about your situation. Usually, in these cases there aren't a lot of recourses that you could take against the city unless they've done something wrong. For example, if one of the construction workers had damaged part of your property in the course of their job come within you may be able to file a lawsuit for negligence. On the other hand, a road closure is or nearly going to be approved by the government and the fact that it hurts businesses is sadly ordinary occurrence where there is no recourse unless some wrongdoing can be found.
In the event that there is no wrongdoing, there may be some other actions that you could take to help you and the other business owners out.
Some of the things that you could try to do is try to form some alliances with the other business owners to find out if there's a way that your business in their business could benefit from a combined marketing effort. One of the things that you could also do is for him to build a group website to communicate your presence that you are open for business despite the construction. The local shopping center where I live sends out a flyer once a quarter two people to remind them that they're open for business no matter what.
One other thing you could do is ask if your state or city has some sort of program that can help you out. For example, one of the things that they could do is give you a very on zoning so that way you could post Flyers where you normally couldn't post them or post signs where it typically is not allowed. They may not have given you any indication of these things ahead of time, but if you can work with them, then you may be able to help increase business to your area.
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