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Thanks for the detailed response.

I've been analyzing the website and their pages for the past hour.

For example, lets say the keyword is "send flowers to city". The domain name is "cityflorists". And she has pages for every city. I'm gonna 410 them, and just keep pages relevant to the city, it'll being down the number of pages to below 50 for sure.

The main question I want to ask, however, without any complications is, that what happens if you 301 over 700 internal pages to the main domain? Will the website get penalized? Or will the domain authority increase?

I just got a contract for a site. After I analyzed their website, I noticed that they have over 700 pages indexed. However, their internal linking structure sucks. It's basically all 700 pages in one directory.

What do you recommend? I redirect all the internal structures to their new locations, or would it be better to redirect all those internal pages to their main domain name, and build a completely new seo-friendly structure?

Redirecting their current pages to each individual page is gonna take a lotta time, and I don't think they're gonna pay for it. :l