[mitthrowaway2]

Shelter is essential, but "real returns" means returns to housing as an asset above inflation, which includes the cost of shelter. Even if the cost of every other good drops to zero and all that is left is rent, the house asset would need to keep going up faster than the rent charged to live there. Maybe that's possible in the case of increasing population and population density, but it can't be possible everywhere, especially with a flat or declining population. Unless interest rates fall forever, that is.