Reference for Megillah 56:4
א"ר אסי בתי כנסיות שבבבל על תנאי הן עשויין ואעפ"כ אין נוהגין בהן קלות ראש ומאי ניהו חשבונות
Assi said: The synagogues of Babylon have been built with a stipulation, and even so we do not act frivolously in them. What [for instance] is this? Doing calculations [for business purposes] in them.
Shulchan Arukh, Orach Chayim
If at the time of building the synagogue, they made a condition to be able to use it [for mundane purposes], it is permitted to use it after it is destroyed, but while it is in use, the condition is ineffective. Even when it is destroyed, to use it for a disgraceful purpose, like planting or financial calculations for the people, the condition is ineffective. What are we dealing with? With synagogues outside of Israel; but with synagogues in Israel, no condition is effective.
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