Hello, this is the development team at Sorai Tokyo.
We are proud to announce the official release of our "Tenant-Exclusive Chat," a service that allows tenants with an active rental agreement at Sorai Tokyo to ask an AI questions about their contract terms and Important Matter Explanation documents 24/7!
We have created a system that enables residents to easily consult their smartphone about complex contract phrasing or specific house rules, such as "Can I keep a pet?" or "What are the costs upon move-out?" In this post, we will introduce the key features and the robust security design behind the development, accompanied by actual screenshots of the interface.
"I’ve moved into my new home, but the rules in my lease agreement are so complex I don't really understand them..." To resolve these anxieties, we have developed a dedicated AI chat assistant that fully understands your individual rental agreement. Here, we introduce Sorai Tokyo's unique PropTech initiative, which combines secure Google Cloud infrastructure with top-tier security measures compliant with the OWASP Top 10.
The Challenge: Documents are "Complex" and "Hard to Locate"
The "Important Matter Explanation" (Jusetsu) and the "Rental Housing Contract" exchanged at the time of leasing are often filled with technical terminology, making them difficult for the average tenant to grasp. Furthermore, if you have questions after moving in—such as "Who is responsible if the air conditioner breaks?" or "What are the rules for the bicycle parking area?"—it can be a major hassle to search through thick documents. We developed this AI chat to solve these issues, allowing tenants to resolve their questions anytime via their smartphone.
1. Four Smart Features That Fully Comprehend Your Rental Documents
This system is not just an AI that provides general real estate knowledge. It offers support tailored to each tenant's "actual contract data."
1
Responses Reflecting "Individual Data"
The AI directly analyzes the PDF text of each tenant's Important Matter Explanation and lease agreement. This allows for personalized responses based on the specific contract conditions unique to your unit, such as rent amount, individual pet policies, and specific covenants regarding restoration to original condition upon move-out.
💡 Pro Tip: Your information is never mixed with other tenants. Responses are generated solely by referencing your specific contract information within a fully isolated and secure environment.
2
"Source Citation" Feature for Reliability
When the AI provides an answer, it clearly indicates which document served as the source. By displaying the referenced document (e.g., Important Matter Explanation or lease agreement) at the bottom of the response, we prevent issues caused by AI "hallucinations" (incorrect answers). This allows tenants to verify the basis of the AI's response at a glance, ensuring high reliability.
3
"Contract Info Sharing" for Families and Partners
A unique and major feature is the ability to share this chat portal not only with the primary leaseholder but also with family members or partners living in the same unit. Each individual can log in separately from their own smartphones to ask the AI about house rules whenever they have a concern.
💡 Pro Tip: Because everyone living in the unit has access to the same accurate information, it prevents disputes between residents caused by misunderstandings like "I wasn't told that" or "I didn't know."
4
Easy Access via Official LINE Account
You can launch the chat directly from the LINE app (using LINE LIFF) that you use daily. Once you complete the initial authentication, you can access the tenant chat screen securely without needing to re-enter a password for subsequent visits.
*Note: The tenant chat integration feature on LINE is exclusively for contracted customers of Sorai Tokyo. New customers (those looking for an apartment) can add our LINE Official Account as a friend to use the 24/7 AI-powered room search consultation and quick initial cost estimation features.
＼ Sorai Tokyo LINE Official Account ／
【For Prospective Tenants / New Users】
Through our LINE Official Account, you can consult about apartment hunting and receive quick initial cost estimates 24/7 for free! Feel free to add us as a friend first.
【For Existing Tenants】
You can link your account here to access the tenant-exclusive chat instantly without entering a password. Start your integration here to resolve rental agreement queries.
Add Friend on LINE
2. A Look at the Smartphone Interface
The screen layout has been optimized for use within mobile browsers and the LINE app.
◆ Secure Identity Verification and LINE Integration
To prevent unauthorized access, we have implemented two-factor authentication that verifies both a unique link code assigned to the tenant and a one-time passcode (OTP) sent to the registered email address.
◆ AI Interaction (Responses and Source Citations)
Upon logging in, you are greeted with a simple chat interface. For instance, if you ask, "Am I allowed to keep a pet?", the AI will instantly scan your lease and present highly specific information, such as whether it is "strictly prohibited" or details regarding "penalties in the event of a breach," along with buttons linking to the source document.
3. Robust Security Design to Protect Sensitive Personal Data
Rental agreements contain highly sensitive personal information, such as home addresses and contact details. To ensure our tenants can use this system with peace of mind, Sorai Tokyo has built the platform based on OWASP Top 10, the global standard for web security, and operates within a secure Google Cloud environment equipped with robust defensive barriers.
🔒 Three Core Safety and Security Measures:
- Robust Cloud Protection and Access Control: We utilize Google Cloud's highly secure infrastructure to provide multi-layered prevention against unauthorized database access, data tampering, and illegal data retrieval.
- Data Encryption and Prevention of Spoofing/Leakage: All communications within the chat are encrypted to prevent session hijacking and spoofing. We have also implemented automated masking of personal data such as email addresses and phone numbers within our system management logs.
- Automatic Safeguards Against Malicious Attacks: We have configured multi-layered guard systems that automatically detect and block heavy traffic (such as DoS attacks) that could stress the system, as well as features to reject malicious "prompt injection" attempts intended to manipulate the AI.
4. Frequently Asked Questions (FAQ)
Q. Who can use the "Tenant-Exclusive Chat"?
A. Tenants who have signed a lease agreement with Sorai Tokyo, as well as their co-habiting family members and partners, can use this service free of charge.
Q. What kind of questions can I ask?
A. You can ask about specific terms in your lease agreement or Important Matter Explanation (Jusetsu), such as pet policies, move-out restoration costs, and contact info for troubleshooting equipment issues.
Q. What is the "link code" required for login?
A. It is a unique code starting with "SORAI-XXX" provided to you during contracting or when setting up the resident portal. If you do not know your code, please contact our support team.
Q. I haven't signed a contract yet. Can I add the LINE Official Account?
A. Yes, anyone can add it! On our LINE Official Account, you can use the AI-powered room search consultation and quick initial cost estimation features for free. Please feel free to register.
Future Outlook
With this release, we have established a portal focused on fast, AI-driven automated responses. Moving forward, we plan to update the system to allow for seamless transitions to human-staffed chat support for complex inquiries or non-standard requests that the AI cannot fully address.
Sorai Tokyo remains committed to leveraging cutting-edge digital technology to enhance our services and support a comfortable and worry-free living experience for all our tenants.
