I have this website that came with a company my family member bought and they want to redo it. To my understanding and research this site was built with something called surge.sh. Is there a way to move this site to WordPress without effecting the SEO? I’m also not sure if this site is ranking due to all of these domains with the cities routed to the main domain or actual SEO work.
You’ll need to rebuild your pages. If you following standard SEO best practice you won’t have any problems. Try and keep the URLs the same, but if you can’t, simply setup redirects. It’s not a difficult job if you have a good understanding of how SEO works.