When Shanahan’s on the Green unexpectedly shut its doors in mid-October, its owner told employees and suppliers that the upmarket American steakhouse would be back after addressing debt issues including some owed to Revenue. Since then, however, the famed central Dublin restaurant has remained closed. A menu stand outside the door still displays contact details for reservations, but there was no reply when The Currency called and emailed, and Shanahan’s website has been disconnected.  In the intervening time, the lease registered for its premises at 119 St Stephen’s Green has expired. Property records show that the term of a 35-year…