Law firm has a main brand site (lawfirmname.com) with lots of content focusing on personal injury related areas of law.  They also do other unrelated areas of law such as bankruptcy and divorce.  They have a separate website for bankruptcy and a separate one for divorce.  These websites have good quality content, a backlinking campaign, and are fairly large websites, with landing pages for different cities. They also have created local microsites in the areas of bankruptcy and divorce that target specific smaller cities that the main bankruptcy site and divorce site do not target well.  These microsites have a good deal of original content and the content is mostly specific to the city the website is about, and virtually no backlinks. There are about 15 microsites for cities in bankruptcy and 10 in divorce and they rank pretty well for these city specific local searches. None of these sites are linked at all, and all 28 of the sites are under the same hosting account (all are subdomains of root domain of hosting account).  Question, should I link these sites together at all and if so how?  I considered making a simple and general page on the lawfirmname.com personal injury site for bankruptcy and divorce (lawfirmname.com/bankruptcy and lawfirmname.com/divorce) and then saying on the page something to the effect of "for more information on bankruptcy go to our main bankruptcy site at ....." and putting the link to the main bankruptcy site.  Same for divorce.  This way users can go to lawfirmname.com site and find Other Practice Areas, go to bankruptcy page, and link to main bankruptcy site.  Is this the best way to link to these two main sites for bankruptcy and divorce or should I be linking upward? Secondly, should I link the city specific microsites to any of the other sites or leave them completely separate?  Thirdly, should all of these sites be hosted on the same account or is this something that should be changed?  I was considering not linking the city specific sites at all, but if I did this I didn't know if I should create different hosting accounts for them (which could be expensive).  The sites work well in themselves without being linked, but wanted to try to network them in some way if possible without getting penalized or causing any issues with the search engines.  Any help would be appreciated on how to network and host all of these websites.