Hi there,
I am currently working on re-doing my website which is currently an 800pg static HTML website; the new site will be over 200,000 pages and will be CMS/Database driven.

Currently I hold #2 rankings for a few major keywords and get 40,000 unique visitors a month.

All page extensions will be lost as the new site launches and besides doing a 301 redirect to take care of this aspect of things what else should I be aware of and prepare for?

Having the site go from 800 pages to 200,000 + pages, is this going to cause any red flags in Google? All content is unique and I have had over 1000+ articles written for the new website.

There is a database of business listings that make up the majority of pages, but the remainder will have content rich unique copy from the 1000 articles.

Any advice would be appreciated.

Nicole