118 East 60th Owners, Inc. v. Bonner Properties, Inc.

NEWMAN, Circuit Judge:

Federal courts must regularly try to determine the content of state law in exercising diversity jurisdiction and must occasionally do so in exercising federal question jurisdiction; it is the diversity jurisdiction, however, that obliges federal courts to make the delicate accommodation between state substantive law and federal procedural law in adjudicating state-created causes of action. The subtlety of that process, compared to the relatively more straightforward adjudication of federal causes of action, is illustrated by this appeal from the denial of a declaratory…