The Nittany Lions moved up five spots from their No. 13 ranking at the end of the 2023 season.
Warren's seven touchdowns were third-most in the nation last year.
"He is as driven and as committed as a young player I've ever been around."
Smith was previously committed to Manny Diaz and Duke.
Allar was one of 36 total and four Big Ten quarterbacks recognized.
The house will be demolished to make room for a replacement for the Pugh Street Parking Garage.