Lu Din Gee
Of course the restaurant located in Lu Din Gee's old location also serves Peking Duck, even though they otherwise serve Shanghai style food. Guess they're looking for leftovers from people still looking for Lu Din Gee at that location. They even call their place Tasty Duck. I do believe Duck House is the continuation of Lu Din Gee so you should go there.
Re: the duck- We ate there last night and I commented to my wife that it's consistently the same, always very good, based on eating it many times (always #1- w/ pancakes). We usually get 1 different dish each time,along w/ the duck. Those dishes have usually been good .
I definitely recommend you go, and besides the duck try a dish w/ konnyaku (Chinese yam).
As Chandavkl points out, go to Duck House not Tasty Duck. Based on 1 visit, Tasty Duck 's duck wasn't nearly as good as Duck House's.
Don't forget to call at least 1 hour before to order the duck.
Duck House (Lu Ding Ji)
501 S Atlantic Blvd, Monterey Park, CA 91754