Two-thirds of American families own their own home, nearly 40% of all owner-occupied homes are now mortgage-free and another 30% have a mortgage debt less than half the estimated sales value of the home, according to a Gallup survey sponsored by the National Association of Realtors. The survey also found that 91016 of respondents view real estate as a sound investment, 8.7% own vacant land, 7.3% own a second single-family residence and another 4.5% own other types of residential, commercial or industrial real estate. Ownership of other real estate besides a primary residence was reported by 38% of persons with incomes of $15,000 or more; 23.7% of those with incomes of $10,000-$14,999, 21.6% of those with incomes of $6,000-$9,000 and 16.6% of persons with incomes of less than $6,000. (HUD) Newsletter, 26 May '75).