Most all that I have stayed at have had washers and dryers - but of course, it might be the one you're really relying on that doesn't, so it doesn't hurt to call and confirm. I called the San Diego La Jolla RI (feeling friendly on Father's Day) and Lee confirmed that they did have washers and dryers for laundry.
Here's a good link with info on the overall brand - click Features and they say Dry Cleaning and on site laundry.
Good luck and welcome to Insiders. Let us know how your trip went.