as of 2014 the Tokyo store was still in business:
http://www.latimes.com/entertainment/arts/la-et-cm-letter-from-tokyo-tower-records-20141210-column.html

and there appears to be an active website: http://tower.jp/store/Shibuya/

RIP Russ Solomon, condolences to famiy and his many customers.

Seek out the DVD documentary ALL THINGS MUST PASS, a must see for
anyone who loved the TOWER stores.

Thomas.