> In practice new housing developments have a tendency to drag local real estate prices up (see also: gentrification).

This is absolutely false, not true, disproven, and made up.

Social housing builders are good for many reasons, 1) they provide competition to the public market, and when efficient don't need to return profit to shareholders so provide a very good competitor in places like Finland and Singapore, 2) social housing builders smooth out the business cycle, because new housing is needed just as much when at the downturn of the business cycle as at the top, so it greatly helps provide stable employment and a stable workforce for housing construction, greatly improving housing.

But the idea that new idea drives up housing prices in any way is, at best, a fiction. It's mostly a lie from landlords and homeowners to try to justify their continued extraction of profits from their idleness.