HB is right, you're going to find that most of the law firms operating here with the same name are 'franchises' or bi-lateral partnerships. One of the few real multi-national ones is based in SD Squire, Sanders & Dempsey L.L.P.
Can you recommend a good U.S. based law firm in the Dominican Republic, one that has control over its Dominican associates and won't milk you for hundreds of thousands of dollars?