How to Write an Address in a Single Line?

For US addresses, the USPS Look Up A ZIP Code tool is definitive.

It renders standardized addresses without abbreviations for things like "South" or "Street:"

18455 S Figueroa St, Gardena CA 90248-4503

It renders suite numbers and the like sans punctuation as well:

1137 Huntington Dr Ste B1, South Pasadena CA 91030-4582

It may account for regional differences in rendering addresses, so try it with yours.

A good rule of thumb is to consider the purpose of the address. If you're informing someone of where something is, spell the address out in full:

"The university's campus, located at 3737 Wascana Parkway, Regina, Saskatchewan, is situated at the edge of Wascana Park."

versus if you wanted to put the address for contact purposes:

"Should you have any questions, please feel free to write to me at 3737 Wascana Parkway, Regina SK S4S 0A2."