If the legal entity is available in the state you want to register it, then you should be ok. Even if the trademark is taken. You can still have a trademark if your use of it is in a different classification as the previously registered trademark. Just make sure it isn't too similar in design and such.
Disclaimer: The information that I post in this forum is NOT legal advice and should not be relied as such. It is intended to provide general information in summary form on legal topics. Formal legal advice should be sought in particular matters.