Hi Bart.
Squaewspaace is not a good platform, to run professional website. It wont cost you too much if you want to make simple websites for your restaurants. If you need some complex features like online ordering, online payment etc then it will cost you little higher. I can make your website to display restaurants' information and menu on the site. It will cost you $300/site. I am willing to know how we can further proceed on it? If you have any questions then feel free to have discussion with me.
I am waiting for hearing from you.
Best Regards,
Nawaz