$13 is just an estimate, the actual terms are 50 cents less than market on the pricing date or NAV on the pricing date,whichever is lower..
a real consideration is that if u don't own many shares, the benefits of the 50 cent discount may be less than what your broker charges u to exercise the rights, brokers have been jacking up fees left and right,one of mine (and the one that happens to have had the RVT shares on 1/28) used to do this for free and now charges $30..
My broker is charging $30 as well. They normally charge me 9.99 on all orders. Says I have until March 6 to reply to them one way or the other because the RO expires March 10. That .50 cent discount would only save me ~$22 after paying the broker's $30 comm...plus RVT could go lower after/than RO price w/discount.