The Clinton Theatre exists and operates today in Portland as the Clinton Street Theater.
Portland’s street numbering changed in 1933.
In 1945, the theater’s name changed to the 26th Avenue Theatre. In 1969, the name was again was changed to the Encore Theatre. In 1976, the theater was again changed to the Clinton Street Theater.
References: FilmYearBook-1926 p. 568 : Clinton St. Theater website : with additional information provided by Shawn.