Lorenzo B. Evans, a Baltimore native who was a former Navy commander and a retired architectural engineer, died Sunday after an apparent heart attack at his home for the past five years in Roswell, Ga. He was 80.

A Mass of the Resurrection for Mr. Evans was being offered today at St. Joseph's Roman Catholic Church in Mendham, N.J.

He retired in 1973 after 18 years as an architectural engineer for the Army and Air Force Exchange Services in Texas and Alaska.

He is survived by his wife, the former Bridget O'Connor; a son, Lorenzo B. Evans III of Baltimore; a daughter, Marty Merchant of White Hall; a sister, Virginia Lipko of Baltimore; and two grandsons.