Ora et Labora
Can I use the Sacristy twice in one turn with the Palace?
One reply explains the combination; no official ruling.
- cubbieblue · Community · 2013-05-17
Yes. The Palace lets you use an occupied building, including the Sacristy you just used, so you can make two wonders in one turn. The Priory can also let you use the Sacristy again.