The obvious solution to this is to build taller and thus more expensive housing in major city's. Unfortunately simply building large buildings like this directly results in 'slums'.
I suspect the way around this is to require the first X floors to be affordable housing without subsidy, and then let people build as many expensive floors above this as they want. This attacks the problem from both ends by reducing the impact of land prices, avoiding blighted areas, etc. But, avoids directly handing money to developers which is a clear avenue for corruption.
I suspect the way around this is to require the first X floors to be affordable housing without subsidy, and then let people build as many expensive floors above this as they want. This attacks the problem from both ends by reducing the impact of land prices, avoiding blighted areas, etc. But, avoids directly handing money to developers which is a clear avenue for corruption.