The price of real estate seems to be goign down throughout the country, not just in a few urban centres but in the rural areas as well. The NHK news reported a few weeks ago the annual statistics for business properties in major cities, and they had all fallen since the previous year. Land prices in suburban and rural areas are also decreasing for a number of reasons. For one thing population growth has stagnated and the population will start decreasing in the next couple of years. Secondly people continue to leave rural areas in droves to get work in the cities, where high-rise apartments are being built like there is no tomorrow, further lowering the demand for land.
The price of actually building a house is still ridiculously high though. It costs about 3 times as much to build a house here as it does in North America, and the houses are much smaller and of much lower quality.