Writing expressions using the SSDT tool

I just started using the SSDT Data Tool and am wondering how to write expressions. What I'm trying to do as a test is create a small report using Vendor Contact info. There are 3 address fields then a city, state and zipcode. I wish to string together all three address fields as long as there is data in each one of them. I have NO idea how to write this expression.

The report will look like this:

Name          Address          City, State ZipCode              Phone                Fax
xxxxxxx  xxxxxxxxxx  xxxxxxxx, xx, xxxxx    (999) 999-9999   (999) 999-9999
                  xxxxxxxxxx
                  xxxxxxxxxx