Coding custom access for editing pages

Hi I'm trying to build a site for a small county and have a few specific requirements and was wondering if anyone has any ideas on if it would be possible to custom build a site like this through SquareSpace with maybe SquareSpace Developer? The county wants a page where they can put new county information and news up but also has a focus on commerce, they would like to grant county business owners to a page on the site, without having access to the rest of the site. The business owners are not super tech savvy so they are looking for a solution in which the business owners may just have to fill out a form with their business information to automate edits to their page, as well as pull information from their Yelp profile or their personal websites.