Ibrahim S Hey IB: are you sure you need a release? Have you had a title prelim done? What is title asking for? Your title company may have current/relevant contact info for getting a release or may not even need it. I say let them do the work.
Yesterday I got a prelim for a property I'm closing on this week. Clean title as expected except, but it showed two small open mortgages from 1979 and 1980. The lender was a local private RE company that's no longer in business, one is owner deceased, the other is in conservatorship. I'm almost certain the loans are paid off as the same lenders loaned again against the property in 1980 and that loan was released in 1998.
Title tells me I need to find someone to release the liens. Hours of research and phone time and I find the heirs of one partner and the conservator of the other. This morning, after prodding the title dept. a little further, they somehow find sufficient evidence that the liens are released and issue a new title report. Wasted most of my day yesterday. In the future, I'll be requesting a double check before I do work that's not needed. :)