Q. Why do different real estate agencies show me the exact same properties?
A. This is because almost all real estate agencies in Japan share a centralized online database called 'REINS' (Real Estate Information Network System), operated by a government-designated association. Once a landlord-side agency (Mototsuke) lists a property, tenant-side agencies (Kyakutsuke) across the country can immediately view, introduce, and broker it.
Q. What should I look for when choosing a reliable real estate agency?
A. Ensure they do not force unnecessary optional fees (like optional disinfection or mini fire extinguishers), explain property drawbacks honestly, and communicate quickly and helpful via chat tools like LINE. For foreign residents, check if they provide bilingual support and have experience with foreigner-friendly approvals.
Q. Is it okay to ask one agency about properties I found on other websites?
A. Yes, absolutely. If you find apartments you like on portal sites (such as SUUMO or HOME'S), you can share the URLs or screenshots with your trusted agency. They can check availability and coordinate viewings for all of them, saving you from dealing with multiple agencies.
Q. Why do portal sites like SUUMO sometimes display properties that are already rented?
A. This is due to a 1–2 day update lag on portal sites, which causes rented properties to remain listed. A reliable brokerage can check the real-time REINS database to confirm current availability instantly.
Q. What is 'property hoarding' (Kakoikomi) in the real estate industry, and how can I prevent it?
A. 'Property hoarding' (Kakoikomi) occurs when a landlord-side agency refuses to share a listing with other agencies to secure both sides of the commission. To prevent this, ask your agent to show you the current status on the REINS database screen directly.
You visit Agency A, then Agency B, and both show you the exact same apartment. If you are searching for a home in Japan for the first time, this can feel like a strange coincidence.
But in the Japanese rental market, this is completely normal. Because there is a system that shares property details nationwide in real time, the standard rule of house hunting in Japan is that almost any agency you visit can introduce you to the same properties.
Knowing this will save you the hassle of hopping from one shop to another. In this guide, we break down how Japan’s centralized database, 'REINS,' works. We also share how you can use this knowledge to find a reliable partner who offers foreigner-friendly approvals, guarantor support, and smooth bilingual communication.
How REINS Works: Why Different Agencies Can Show You the Same Properties
Real estate agencies in Japan share vacancy details in real time through a government-designated database called "REINS." This allows any licensed broker to search, introduce, and guide you through almost any listing nationwide.
The system that enables different agencies to show you the same rooms is built on a shared database called REINS (Real Estate Information Network System). It is a government-designated online network. The moment a property manager registers an open room on REINS, around 130,000 brokerage companies across Japan can immediately view and introduce it to their clients.
The Two Roles of Agencies: "Mototsuke" (Landlord-side) and "Kyakutsuke" (Tenant-side)
Rental transactions involve "Mototsuke" (landlord-side property managers) and "Kyakutsuke" (tenant-side brokers). Because they collaborate on a shared database, you can access properties through any tenant-side agency.
The rental process, from listing an apartment to finalizing the lease contract, is divided between two main positions. Their respective roles and relationships are outlined below:
Position
Key Roles & Functions
Mototsuke Company *(Landlord-side / Property Manager)*
The agency commissioned directly by the owner (landlord) to manage the property and find tenants. They register the property details on REINS, making the information available to other real estate agencies.
Kyakutsuke Company *(Tenant-side / Brokerage Agency)*
The agency acting as your main contact point as an apartment seeker. They search REINS for properties matching your preferences, introduce them to you, and support you through viewings and contract procedures.
Most real estate storefronts you see on the street function as the latter—'Kyakutsuke' agencies. As shown in the diagram below, the moment a 'Mototsuke' agency (connected directly to the landlord) registers a property, all 'Kyakutsuke' agencies across Japan can instantly view the listing and introduce it to you.
The Real Update Lag on Portals (SUUMO, etc.) and "Unavailable" Listings
Major portals (like SUUMO or HOME'S) have a 1-to-2 day update lag, meaning rented apartments often remain listed. REINS updates instantly, allowing a reliable agency to verify the exact status in seconds.
While real estate portals like SUUMO or LIFULL HOME'S are useful, they have a major limitation: an update lag of one to two days (sometimes longer).
Once a property manager (Mototsuke) accepts an application or signs a lease, there is a delay before the listing is removed from public websites. During this lag, the property is still visible, leading to situations where you inquire about a home only to be told, 'Sorry, it is already rented.' These are often referred to as 'phantom' or 'outdated' listings.
In contrast, the REINS database updates in real time the moment a property manager changes its status. If you send the link of an apartment you found on SUUMO to a responsive agency, they can check REINS and reply within minutes: 'Yes, it is still active. Would you like to view it today?'
"Kakoikomi" (Property Hoarding) and How to Prevent It
"Kakoikomi" occurs when a landlord-side agency falsely claims a property is unavailable to keep the listing to themselves and double-side the commission. To avoid this, ask your brokerage agent to verify the listing's real-time status on the REINS database.
The Japanese rental system is designed around a collaborative framework where landlord-side and tenant-side agencies work together. However, some landlord-side (Mototsuke) companies engage in a practice known as 'Kakoikomi' (property hoarding or listing withholding).
This happens when a landlord's agent falsely tells other brokerage companies that an apartment is 'under application' or 'already taken.' Their goal is to find a tenant directly themselves, allowing them to collect a commission from both the landlord and the tenant (known as a 'double-sided transaction').
For apartment seekers, the downside is clear: you might not be able to rent the property through the agency you trust, or you might be told a great apartment is unavailable when it is actually vacant.
To protect yourself and ensure you can apply for your preferred home, if an agency tells you a listing you found is 'already rented,' you can ask your agent:
'Is this listing currently registered as active on REINS?'
'Could you check the current status on the REINS database screen and show me?'
'Could you check the recent confirmation log with the management company or confirm why co-broking is not allowed?'
A reliable and transparent agency will never hesitate to answer these questions. They will gladly show you their screen or call the property manager to verify the listing on the spot. This open attitude is a clear sign of a trustworthy partner.
If Every Agency Can Show You the Same Rooms, How Should You Choose One?
Since listings are identical across agencies, you should choose a broker based on service quality, cost transparency, and responsiveness rather than the properties they advertise.
Because agencies share the same REINS system, renting a property through Agency B after finding it on Agency A's site is simple.
Therefore, which agency you choose to sign your contract with is far more important than where you find the listing. Here are four key factors to consider when selecting your representative in Tokyo.
1. Avoid Unnecessary Optional Fees and Forced Add-on Costs
Compare initial cost estimates to ensure optional fees (like disinfection or support services) are not forced as mandatory contract conditions.
Even for the exact same apartment, your upfront moving costs can differ by ¥30,000 to ¥50,000 depending on the agency. This difference is usually due to extra fees added by the broker.
Typical add-ons include 'indoor disinfection fees' (¥15,000–¥20,000), 'mini fire extinguisher fees' (¥10,000–¥15,000), or 'resident support services' (¥15,000–¥20,000). While these should be optional, some brokers claim they are mandatory conditions for the lease. When you receive an estimate, check whether these items can be declined. An honest agency will be transparent about upfront costs from the very first quote.
2. Honest Disclosure of Drawbacks and the Neighborhood
Choose an agent who proactively explains potential drawbacks (like noise, lack of sunlight, or flood risks) rather than just highlighting the positive features.
Be cautious of agents who only talk about positives like 'close to the station' or 'recently renovated' while ignoring the downsides. A truly helpful agent will point out issues: 'This room faces north, so it gets cold in the winter,' 'The street gets busy at night,' or 'Let's check the local hazard map for flood risks.'
During viewings, a good agent will help you check the status of the trash area or the thickness of the walls, ensuring you don't face unpleasant surprises after moving in.
3. Fast and Responsive Support via LINE
Apartments in Tokyo rent out quickly, making response speed vital. Working with an agent who replies promptly via LINE is key to securing your preferred room.
In Tokyo's rental market, popular apartments are often taken within hours of listing. The speed at which you and your agent communicate is critical.
If an agency takes days to reply or insists on phone calls, you might miss out on a great listing. A responsive partner who lets you send URLs via LINE and queries REINS immediately is a huge asset.
For international residents, this speed is even more critical because foreigner-friendly apartments require pre-screening for visa types and guarantor company approvals. A bilingual agent who can quickly communicate with landlord-side managers and guarantor firms on your behalf will make your application process much smoother.
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4. Ability to Consolidate All Listings Under One Window
Instead of inquiring with multiple agencies for different listings, send all URLs to one trusted broker who can verify availability and organize viewings for all of them.
If you find three options on SUUMO, two on HOME'S, and one recommended by a friend, you can send all the links to one trusted agency. They can check availability for all of them on REINS at once.
If you contact a different agency for each listing, you will have to fill out multiple inquiry forms, repeat your details, and handle constant calls and emails from different agents. Choosing a single representative simplifies your search and makes comparing choices easier.
For international residents, this approach is particularly helpful. A single dedicated agency can check which properties welcome foreign residents, saving you from receiving rejections from multiple brokers.
Conclusion: The Smart Way is Finding a Trusted Partner, Not Just a Property
Since listings are shared, the best way to find a home in Tokyo is to find a reliable, transparent, and responsive agent who can handle all listings on your behalf.
Understanding that most licensed brokers can access the same properties changes how you approach apartment hunting in Japan. You do not need to visit multiple storefronts and explain your requirements repeatedly.
The process is simple: choose one reliable Kyakutsuke agency and share the links to the properties you want to see. They will check the real-time databases, contact the landlords, organize your viewings, and guide you through the applications.
Find an agency that avoids hidden fees, shares disadvantages honestly, and replies quickly via LINE. For international residents, having a bilingual partner who understands the foreigner approval process and guarantor requirements is invaluable.
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