http://www.youtube.com/watch?v=j2U4cR2c20s
Back to the history ...
Some of the earliest-known Wendy's units in Portland, OR are:
*4829 SE 82nd Ave. (opened 1977 / closed 2000s)
*8445 SE McLoughlin Blvd. (opened 1981 / closed early 1990s)
*232 NE 82nd Ave. (opened 1980 / newer roof but still original frontage)
*2880 SE Powell Blvd. (opened 1980 / retains original mansard roof)
*1405 N Lombard St. (opened 1980 / newer roof but still original window frontage)
Most of these stores have discard the old mansard roofs for the Victorian-style roofs when they became commonplace around 1983. Also, the original tower signage (with a similar logo to what is seen on the mansard roof of the 29th & Powell store) has long disappeared from the early stores.
These locations are presumed to all have opened sometime after 1982:
*17217 SE McLoughlin Blvd., Milwaukie, OR
*16220 SE 82nd Dr., Clackamas, OR (Greenhouse Square)
*11607 SE 82nd Ave., Clackamas, OR (Clackamas Town Center) (updated with red lettering on front after the 1990s)
*1335 Molalla Ave., Oregon City, OR

Survivor... Wendy's by mobycat, on Flickr
(This store appears to be a prototype for it has both the yellow roof and the newer-style window frontage aka a glass solarium.)
~Ben