Nine years ago I bought a three-unit building in a town whose registered population had dropped 18% since 2000, and I nearly walked away from the deal. Today that building sits at 100% occupancy and throws off more net cash flow per unit than two of my properties in bigger cities. Regional population decline is not one single story of decay everywhere u2014 it plays out very differently block by block, and my job as a landlord is to figure out exactly which kind of decline I am looking at before I sign anything.
Across my 9 rental properties, five sit in towns officially classified as shrinking or slow-growth areas outside the biggest metro cores. That mix did not happen by accident. Watching the population data closely over the last decade has changed how I pick locations, how I budget renovations, and when I decide to sell rather than keep fixing a place up.
Why City-Wide Population Numbers Fooled Me at First
ud83duded2 RECOMMENDED PRODUCTS
Japan Real Estate Investment Guides
Understand the market before you enter it u2014 these books accelerate your learning curve.
My first mistake was reacting to headline city statistics. A city-wide population drop of 12% over 20 years sounds like a reason to avoid the whole area, but that number is an average across dozens of neighborhoods that are moving in opposite directions. In the town where I bought that three-unit building, the area within 800 meters of the train station actually grew by about 4% in the same period, while neighborhoods more than 3 kilometers out lost over a third of their residents. The city-wide number told me almost nothing useful about the specific street I was buying on.
The Three-Ring Method I Use to Read a Town
ud83duded2 RECOMMENDED ON AMAZON US
Japanese Language Textbooks (N3 Level)
Reading contracts in Japanese removes your dependence on agents and translators.
These days I split any candidate town into three rings before I even look at a property listing: within 800 meters of the nearest station, 800 meters to 2 kilometers, and beyond 2 kilometers. I pull ward or town population figures for each ring going back 10 years, not just the city total. If the inner ring is flat or growing while the outer ring is shrinking, that tells me the town is consolidating around its center rather than dying outright u2014 and that is exactly the pattern behind five of my current properties. A town losing people overall but concentrating the ones who remain near transit and shopping is still a workable rental market; a town shrinking evenly across every ring is one I now avoid completely.
Cutting My Renovation Budget to Match Reality
In a growth-area property I will still spend up to 2 million yen renovating a unit, because rents can climb back over time. In a shrinking-area property I cap myself at around 1.2 million yen per unit and I am ruthless about where that money goes: new kitchen counter, updated bathroom unit, fresh flooring, and paint. I skip cosmetic upgrades like built-in closets or fancy lighting fixtures that do not move the rent needle in these towns. On one renovation last year I saved roughly 400,000 yen by reusing the existing bathtub shell and just replacing the fixtures and vanity, and the tenant who moved in six weeks later never asked about it.
Shifting Unit Mix Toward Smaller, Cheaper Rooms
ud83duded2 RECOMMENDED PRODUCTS
Due Diligence Checklists & Guides
Never skip due diligence. These tools help you ask the right questions.
Ten years ago most of my buildings were family-oriented 3LDK units. In shrinking towns, families with children are exactly the demographic leaving fastest, while single workers, retirees, and downsizing older couples are the ones staying or moving in. So when a family unit turns over in one of these areas, I now split it or reconfigure it into two smaller 1K or 1DK units instead of re-renting it as-is. Rent per unit drops from around 65,000 yen to about 52,000 yen, but total building income goes up because I fill both units, and average vacancy time on these smaller units has dropped from roughly 4 months down to about 3 weeks. Smaller, cheaper, simpler wins in these markets almost every time.
My Exit Rule for When a Town Crosses the Line
Not every shrinking town stays workable, and I have sold two properties in the last 6 years specifically because of population trends. My exit rule is simple: if a property sits more than 2 kilometers from any train line, the surrounding town has lost more than 25% of its population over 20 years, and my own vacancy rate in that specific building exceeds 20% for two consecutive years, I plan an exit within 3 years rather than pouring more renovation money in. Selling early while the building is still structurally sound gets a far better price than waiting until it is the last occupied unit on the block.
What I Check Before Buying in Any Shrinking Region Now
Before I make an offer on anything outside a core metro area, I run through the same short list every time:
- Ten-year population trend for the specific 800-meter ring around the property, not just the city total
- Distance to the nearest train station and how many trains run per hour at peak times
- Number of new construction permits issued nearby in the last 3 years
- Local vacancy rate for similar unit types, pulled from at least two different rental listing sites
- Whether a major employer, hospital, or school has announced plans to close within the next 5 years
If three or more of those checks come back negative, I pass on the deal no matter how low the asking price looks. I have walked away from buildings priced 30% below what I calculated as fair value because the underlying population trend told a story the price tag could not fix.
Population decline is a real force in a lot of Japan right now, but it is not evenly distributed, and treating every shrinking town the same way is how landlords lose money. That is the approach I use across all 9 of my properties, and it is why the smallest, cheapest building in my portfolio still pays its own mortgage every single month.
Complete Roadmap: First Rental Property in Japan
Everything I wish I knew before my first purchase u2014 financing, due diligence, negotiation, and year-one management guide.
ud83cudfe0 More from DIY Father
15 years of landlord experience u00b7 3 apartment buildings u00b7 DIY renovations that saved millions of yen. Browse all articles at diytosan.com
