Do I need a separate bank account for each property?

No, but you need to keep separate accounting records for each.

You can use one bank account for all properties held within the Series LLC as long as you keep accurate accounting records for each individual property. While the process of keeping separate and accurate records is not complex - it could involve merely “color-coding” each transaction by property - it is very important. Failure to keep separate records for each property could result in “commingling of assets” which can defeat the limited liability each property receives in a Series LLC.