Thanks for your most interesting response!!!
From what you are saying the greatest payoff will be in developing new content on an ongoing basis.
A few questions:
-I also have hundreds of product pages in the form of buildings and listings containing 50 and 300 words. Many of them don't have text links to other pages. You think I am best off just editing/adding a paragraph or so and inserting text links to other pages on the site? From your post I am unclear if you are adding the links in some sort of automated way. In any case, sounds less traumatic than a total re-write.
-Are you using posts on social media (Google+, Facebook, Twitter) to exclusively promote your site or are you engaging in any link building?
From what you are saying (as well as other opinions) I guess I need to stop thinking of gaming the system and more in terms of creating very useful content.
Alan