Many people have homes in two states. Legally, you do not need separate estate planning documents for each state, but it may make sense from a practical perspective.
The Constitution of the United States requires that states give “full faith and credit” to the laws of other states. This means that your will, trust, durable power of attorney, and health care proxy executed in New York (Just to pick one state) should be honored in the state where you have a second home. That’s the law.