 In the late 1980s the city had an aging population of 317,000.Construction activity had moved away from the inner ring of Tel Aviv, and had moved to its outer perimeter and adjoining cities.A mass out-migration of residents from Tel Aviv, to adjoining cities like Petah Tikva and Rehovot, where better housing conditions were available, was underway by the beginning of the 1970s, and only accelerated by the Yom Kippur War.