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The Arts Place has no facility for developing sheet film in trays. When it moves back to the Town Center it will. They do, however, have tanks for developing 4 x 5 film. I suggest going on either Saturday or Wednesday when John Hoover will be there to help you. He is extremely knowledgeable and is an avid 4 x 5 shooter. They have Saunders LPL enlargers there with a full complement of lenses. They provide all chemicals, and even have Pyrocat HD (I know this because I donated it). All you need provide is paper.
I would avoid Glen Echo since their enlargers are quite antiquated with no variable heads. You have to use filters there, which you'll also have to provide. (Yuk!) They also leak like crazy.
HTH
Jim