This framed and matted mixed oil and watercolor on paper painting measures 12" L X 8 1/2" H. It seems to date from the 1970's.
WT Carlsen (20th Century) may have been born in Denmark, immigrating to Canada in 1954. Later he may have relocated to Chicago and still later to the East Coast (either New York City or Boston).
Not much else is known about him except that many of his paintings, up until the mid 1970's, were of modernistic city skylines or cityscapes. Although, he also painted other subject matter and themes, as this piece would attest.