I was told that you shouldn't use lots built in your main hood in Uni subhoods or vice versa because it can cause a problem with aging controllers. I was looking for more information or at least to be pointed to a thread where I could find the info. I never thought this could be an issue as I have done so and been playing this way for a long time without any issues. Thanks in advance for your help.
UPDATE: I continued to look for answers and I came across some information at MATY
http://www.moreawesomethanyou.com/smf/index.php/topic,12165.0.html (Lord Darcy post). I guess I've never had a problem because I had did what was necessary to prep the lot without knowing I was doing it. So once again I've answered my own question...lol...thanks me.