The Rehoboth Church of God no longer exists in Washington DC. Nor does it’s 1957 address 1101 8th St NW. There is a convention center at that spot. So if it were still there it would be in Mt. Vernon Sq., next to Shaw. Really doesn’t matter as they did not provide much information to the 1957 Church Survey.
CS-42-Rehoboth Church of God by Mm Inshaw