I have some Kodak 4x5 Ektapan dated 3/2004 that I've stored at 70F in my basement. Will it still be ok? Should I put it in the fridge?

It's the last 25 sheets of a 100-sheet box.

Thanks in advance for the advice.

Better if it had been stored in the fridge all along, but putting it there now can't hurt. I'm assuming Ektapan is color negative film? If so, storage is more critical than b/w. Only way to find out condition is to shoot some and see what gives.

Ektapan is American black and white negative I believe.
High speed B&W can gain fog with age and poor storage.
Just try some sheets developed as the manufacturers reccomendations and see what the density of the negatives are like.
You can get anti-fog solution to put into the developer.
Just don't risk using it on anything important till you know if there's any fog.