Tokyo Commercial Security
Every Building Has a Weak Lock. We Find It First.
Rekeying entire office floors overnight. Installing access-control systems in Marunouchi high-rises. Emergency master keys while building managers pace the lobby.
Trusted by property managers across Shinjuku, Shibuya, Marunouchi & Roppongi
Shibuya · 40-Floor Office Tower · 2025
312 cylinders.
One weekend.
Zero tenant complaints.
A Shibuya property management firm acquired a 40-floor office tower mid-month. The previous operator retained master keys for 6 of the building's 8 access zones. Full rekey before Monday morning was non-negotiable.
We mobilised 8 certified technicians Friday at 22:00. Working floor-by-floor with a custom sequencing protocol, we rekeyed all 312 cylinders, commissioned a new master key hierarchy, and had the building fully operational by Sunday at 08:00 — before a single tenant arrived.
"We gave them a building on Friday night and got it back Sunday morning — fully secured, documented, and with a master key schedule I could hand straight to the property committee."
Nakamura Hiroshi
Senior PM, Shibuya Asset Management K.K.
Before
Generic cylinder, 6 zones compromised
After
High-security cylinders, 3-tier master hierarchy
Call received
Corporate facility director, locked out of server room
Technician dispatched
Shinjuku depot, ETA confirmed
On-site arrival
14 minutes from call
Access restored
Non-destructive entry, cylinder inspected
Documentation issued
Incident report, new key cut on-site
Shinjuku · Corporate Server Room · 02:14 JST
2 a.m.
Server room locked.
19 minutes later — open.
A facility director at a Shinjuku financial services firm called at 02:14 on a Thursday. A staff member had left with the only key to the server room. A scheduled maintenance window was closing.
Our Shinjuku depot had a technician on-site in 14 minutes. Non-destructive entry. Cylinder inspected and cleared. New key cut on-site. Incident report issued before 03:00. The maintenance window ran on schedule.
"I've used three locksmiths in Tokyo over the years. Tumbler is the only one I've called twice — and the second time I didn't even check the price. Speed and discretion are worth more than I thought."
Watanabe Kenji
Facility Director, Shinjuku Financial Services Group
Ready to assess your building's vulnerabilities?
We assess your building's access architecture, identify vulnerabilities, and deliver a written remediation plan — within 48 hours for scheduled requests, same-day for urgent cases.
Scheduled
Full audit within 48 hours. Written report, remediation quote.
Urgent
On-site within 4 hours. Immediate risk assessment.
Emergency
Dispatch in under 20 minutes. 24/7 coverage across Tokyo 23-ku.
24-Hour Dispatch
+81-3-0000-0000Roppongi · 4-Building Portfolio · Access Control Migration
4 buildings.
351 access points.
Single management view.
A Roppongi property group managing four commercial buildings needed to migrate from legacy key-based access to a unified card-reader system. Previous attempts by two other contractors had stalled at building 2 due to wiring complexity.
We conducted a full access-point audit across all four buildings, designed a migration sequence that kept each building operational throughout, and completed the card-reader installation in 11 days. The property director now manages all 351 access points from a single dashboard.
"Two contractors gave up on building 2. Tumbler audited it, explained exactly what the previous teams had missed, and had all four buildings running on a single system in under two weeks. That's the level of technical depth we needed."
Tanaka Yuki
Portfolio Director, Roppongi Property Holdings
Access Architecture
Card Readers
Controllers
Management Portal
Audit Log
Request a Security Assessment
We assess your building's access architecture, identify vulnerabilities, and deliver a written remediation plan — within 48 hours for scheduled requests, same-day for urgent cases.
Scheduled
Full audit within 48 hours. Written report, remediation quote.
Urgent
On-site within 4 hours. Immediate risk assessment.
Emergency
Dispatch in under 20 minutes. 24/7 coverage across Tokyo 23-ku.
24-Hour Dispatch
+81-3-0000-0000