I wanted to follow up and say I got it working. I did some more searching and found out about variables. This is what ended up working:
var Text Landlord = If(Contains([Landlord Name], "Individual"), Left([Landlord Name],","), [Landlord Name]);
var Text Care = If(Trim([In Care of:])<>"","c/o" &" "& [In Care of:], [In Care of:]);
List("\n", $Landlord, $Care, "",
List(", ", [Address: Street 1], [Address: Street 2]), "",
List(", ", [Address: City], [Address: State/Region]), [Address: Postal Code])
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Kelly-Ann Taintor
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