The first question almost every serious tenant asks me now is how old the building actually is, not just what year I say it was built. Last spring a prospective renter pulled up the registry record on her phone before she even finished the walkthrough of one of my 9 properties, and she was right to do it u2014 I have had two units over the years where the listing photos undersold just how much a 1988 build was starting to show its age. In Japan, building age (chikunensu) disclosure is not optional small talk, it is a legal obligation baked into the brokerage process, and after 15 years of managing everything myself I have learned exactly what has to be shown, when, and why getting it wrong can cost a landlord far more than a bit of embarrassment.
What follows is the version of this topic I wish someone had handed me back when I closed on my second property, instead of the vague explanation I got from a broker who was clearly in a hurry to move on to the next listing.
What the disclosure rules actually require
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Under the Building Lots and Buildings Transaction Business Act, any licensed agent handling a sale or lease has to disclose the construction year of the building as part of the important matters explanation (juuyou jikou setsumei) before a contract is signed. This is not a verbal mention u2014 it has to appear in writing, sourced from the building registry certificate (tokibo tohon), not from whatever date the landlord remembers or wrote on an old flyer. I keep a certified copy for all 9 of my properties in a single folder now, because I got caught once with a tenant who requested it on the spot and I had nothing to hand her except my own guess, which was off by 3 years.
Why the exact year changes everything for tenants
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Renters in Japan do not just want a number, they want to know which side of 1981 the building falls on. That year marks the switch from the old earthquake standard (kyu-taishin) to the new one (shin-taishin), and I have watched asking rent drop by roughly 15 to 20 percent on comparable units simply because a building was built in 1979 instead of 1983. One of my properties, built in 1980, sits right on that line, and I have had to explain more than once that it passed a supplementary seismic retrofit in 2003 u2014 which is exactly the kind of detail that needs to be documented, not just spoken about during a viewing.
The paperwork I keep on every property
Over the years I have settled on a fixed set of documents that I update whenever anything changes, and I hand a copy to my property management company so nobody is scrambling when an inquiry comes in.
- Building registry certificate showing the original registered construction date
- Building confirmation certificate (kenchiku kakunin) from the original permit, when I can locate it
- Any earthquake retrofit certificates, including the 2003 one I mentioned above
- Records of major renovations u2014 roof, plumbing, exterior u2014 with the year each was completed
- A one-page summary sheet translating all of the above into plain language for tenants who do not read construction jargon
That last item took me an embarrassingly long time to start doing. For years I assumed tenants would just ask if they had questions, but most people do not want to interrupt a viewing to ask what shin-taishin means, they just want it explained on paper.
How this intersects with loan and insurance disclosure
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Building age is not only a tenant-facing issue. When I refinanced one property in 2019, the bank required the same registry-sourced construction year before approving terms, and a building older than 30 years triggered a shorter loan term and a slightly higher rate u2014 about 0.3 percent higher, in my case. Fire and earthquake insurers ask the identical question, and a mismatch between what I told the insurer and what the registry says can void a claim. I learned to treat the registry certificate as the single source of truth across every one of these conversations, rather than repeating whatever number happened to be in my head that day.
Mistakes I made early on
My first real error was relying on a sales listing from years earlier that rounded the construction date to the nearest gengou era change, which was off by 2 years from the actual registry date. A tenant caught it, and while nothing came of it legally, it cost me credibility during lease renewal negotiations. My second mistake was assuming a full renovation reset the clock u2014 it does not. A 1985 building with a 2015 gut renovation is still a 1985 building for disclosure purposes, even though it might show and feel like something built in 2015. Getting that distinction wrong with a broker almost delayed a closing by 3 weeks while we sorted out the correct paperwork.
What I tell new landlords
If you are picking up your first property here, pull the registry certificate before you even finish negotiating the price, not after. It takes one trip to the legal affairs bureau or a same-day request through a judicial scrivener, usually for a few hundred yen, and it settles the construction year question permanently so you are never guessing in front of a tenant or a loan officer. That single habit has saved me more headaches across my 9 properties than almost any other piece of paperwork discipline I picked up in 15 years of doing this myself.
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