Jamaica Plain resident John Rowse, the founder of Boston Building Resources, died on March 29. He was 74. A genuine visionary, John founded the Boston Building Materials Co-op in 1978 and co-founded the nonprofit Reuse Center in 1993. He went on to start a third organization, Community Boat Building, in the last decade of his life. John was trained as an architect and had a passion for sharing his knowledge with other homeowners, especially those with fewer financial resources, so that they could take good care of their homes.