John B. Agen (1856-1920) was a Seattle businessman who dominated the dairy products industry in Seattle from 1890 to 1916. He did not live in the Fremont neighborhood, but a three-block section of property came to be owned by Agen by way of B.F. Day. B.F. Day was an early resident of Fremont who was a community activist and who donated land for building the present B.F. Day School.
Like many people in Seattle, B.F. Day was badly affected by the economic crash known as the Panic of 1893. In a court case ten years later, Mr. Day was questioned as the whether he was hiding any money or assets such as real estate. He explained that during the 1890s some of the land he had owned, had been transferred into the names of other people so that Day would not lose the property. One of the people who helped B.F. Day at that time was John B. Agen. Agen later filed this plat map for the property in the 4100 block between Woodland Park Ave to Stone Way.
