There was a man name Titius Justus whose house was next door to what?

ANSWER

a synagogue

Acts 18 :

(7) Then Paul left the synagogue and went next door to the house of Titius Justus, a worshiper of God. (8) Crispus, the synagogue leader, and his entire household believed in the Lord; and many of the Corinthians who heard Paul believed and were baptized.
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