/property: = Set or override these project-level properties. is the property name, and is the property value. Use a semicolon ...

/property:=  Set or override these project-level properties.  is                      the property name, and  is the property value. Use a                      semicolon or a comma to separate multiple properties, or                      specify each property separately. (Short form: /p)                      Example:                        /property:WarningLevel=2;OutDir=bin\Debug\