(note: I did try to mask my urls without loosing relevant information)
Currently: We use a third party that provides us with the cms for an important revenue generating vertical.
Right now this is how it is set up.. we link to gooddomain.com which redirects to ourcoredomain.com/industry... which is actually a frame set that has the src being nameofthirdparty.com/industry/site/state/ourtown..
We do have another domain that is pretty good but it hasn't been pointed anywhere since two iterations ago.. Google still knows about the domain and there are still other sites in the industry that link to it..
Here is what I am thinking I will do and I want to know what you think about it..
I have setup that domain that hasn't been used for a while and have a coming soon page there while I develop the new site on that domain.. so the engines won't further forget about it.. as soon as I launch the new site I will directly link to this domain, I will 301 the currently promoted domain to this domain and will change the frame src of ourcoredomain.com/industry to the new (previously unused) domain.. but not link to it.. just to make sure I get any traffic that might be using that url..