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Siam Patumwan House, an office building developed by Siam Motors—which has maintained partnerships with Japanese companies for over 70 years—was constructed by SMCC (Thailand), the Thai subsidiary of Sumitomo Mitsui Construction. True to the meticulous standards of Japanese companies, every detail has been carefully considered, and the moment you step inside, you are greeted with an atmosphere of dignified elegance throughout the entire building.
This Grade A office building has been awarded LEED Gold, Fitwel, WiredScore, and SmartScore certifications, promoting sustainability in line with international ESG standards. It is also distinguished as a smart building, featuring advanced connectivity such as Wi-Fi 6 and fiber-optic networks.
We are pleased to introduce you to Siam Patumwan House!
This office building is located in Siam, the heart of Bangkok. By using the skywalk directly connected to BTS National Stadium Station, it is accessible within just 5 minutes.
Many Japanese companies such as Hitachi Elevator, Yamaha, Daikin, and SMCC have already moved in. The building is used as both showrooms and headquarters offices, with tenant companies’ products installed throughout the building.
・Construction by SMCC
・Elevators and escalators by Hitachi
・Audio/Visual (A/V) systems by Yamaha
・Air conditioning system (VRV) by Daikin
Situated in the center of the Siam district and adjacent to the Bangkok Art and Culture Centre (BACC), the building enjoys a calm atmosphere despite being in a prime downtown location. At the same time, it is surrounded by vibrant shopping malls such as Siam Discovery and MBK Center.
This area is also a popular tourist destination, with many luxury restaurants and hotels, making it highly convenient for business travelers and corporate entertaining.
The skywalk connects directly to BACC, Siam Discovery Center, MBK, and National Stadium. The surrounding area is bustling with malls, restaurants, and sports facilities.
Let’s see how to access the building from BTS National Stadium Station with photos!
Exit Gate 3 of BTS National Stadium Station, proceed onto the skywalk, and you will find a connecting passage leading directly to the building on the opposite side of MBK Center.
This passage connects directly to the 2nd floor of Siam Patumwan House and takes about 5 minutes from the station. There are no stairs to climb, so access is smooth and convenient.
Although Siam Station is about the same distance in a straight line, crossing roads and stairs makes it less convenient. Using National Stadium Station is the most practical option!
This is a Grade A office building that has obtained four certifications: LEED Gold, Fitwel 1 Star, WiredScore Platinum, and SmartScore Gold. These international standards guarantee the building’s quality. After acquiring WiredScore and SmartScore certifications, interest from technology-related companies has been increasing!
LEED Certification: An environmental performance rating system provided by the U.S. Green Building Council, assessing buildings and land use. Buildings are ranked into four levels: Platinum, Gold, Silver, and Certified.
Fitwel Certification: A system that emphasizes occupant health, developed by the U.S. Centers for Disease Control and Prevention (CDC) and the U.S. General Services Administration (GSA). It evaluates how well buildings provide a healthy environment across 12 categories.
WiredScore: A benchmark that evaluates the digital infrastructure of office buildings (telecommunications, network connectivity, security, etc.). It quantitatively measures the readiness for digital adoption.
SmartScore Certification: A comprehensive benchmark for evaluating office building sustainability. It considers energy efficiency and environmental impact, scoring sustainability and serving as a guide for continuous improvement.
Designed with inspiration from the traditional Japanese architectural motif of “lattice,” the lobby of this building immediately conveys a dignified atmosphere. It offers a sense of luxury while maintaining warmth and approachability through its wood design elements.
Access Control: High-security elevators programmed to allow access only to designated floors.
Authentication System: Advanced face recognition, smart card readers, electromagnetic locks, and surveillance camera systems powered by Hitachi’s Smart Building Platform.
Thermal Scan: Thermal scanning cameras installed at the main entrance as a COVID-19 countermeasure.
Office floors span from the 8th to the 32nd floors, divided into two zones:
・Low Zone: 8th – 19th floors
・High Zone: 20th – 32nd floors
There are separate elevator banks for each zone: 8 elevators for the low zone and 8 elevators for the high zone, totaling 16 elevators. With this sufficient capacity, waiting times are kept to a minimum.
The units come in a variety of sizes and are efficiently designed. Unlike in other buildings, where irregular layouts can result in obstructive columns or wasted space, here you won’t face such concerns. The layout ensures maximum usability.
The office area has a generous ceiling height of 3 meters, creating a spacious and open environment without any sense of crowding. This provides a comfortable working atmosphere with excellent natural light through large windows.
◦ Daikin VRV system
◦ Air filters to prevent dust and chemical substances, ensuring indoor air quality
◦ CO2 sensors for monitoring ventilation and fresh air supply
◦ Use of low-emission materials and exhaust systems to control chemicals and pollutants
◦ LED lighting, motion sensors, and insulated glass with low-emission coating
◦ Daylight and occupancy sensor-based lighting control system
◦ Pantry and restroom lighting controlled by motion sensors
Although located in the center of Siam, the building is surprisingly surrounded by few high-rise buildings, offering a 360-degree panoramic view of Bangkok. There is no concern about poor sunlight. Of course, the view will differ depending on the floor you occupy, so it’s an important point to check during inspection.
The 11th floor is designed for hosting meetings and parties with external guests, offering an overall luxurious and prestigious atmosphere. Inspired by Japanese design, this facility provides a refined space suitable for corporate events.
The Sky Garden Bar provides food and beverage service for events and parties. Scheduled to open in February 2025.
◦ Large conference hall with a maximum capacity of 250 people (can be divided into two rooms)
◦ Available for both tenants and external users (tenants receive special pricing)
◦ Services include: free Wi-Fi, LED screen + stage, standard audio system, parking, water, and catering
This facility is fully equipped and spacious, making it ideal for large-scale events, press conferences, and seminars.
◦ Small meeting pods (up to 6 seats) × 3
◦ Boardrooms (up to 20 seats) × 3
There are also two screening rooms that can accommodate around 25 people each. Equipped with YAMAHA audio systems, they are suitable for showing training videos or hosting presentations.
The 6th floor houses a spacious cafeteria with eight restaurants in operation. Tenants don’t need to go outside on rainy days to buy lunch. Coffee shops are also available, making it a convenient place for breaks during work hours.
The restrooms are as clean and comfortable as those found in hotels. There are also multipurpose restrooms, equipped with showers—perfect for freshening up after sweating, a thoughtful feature for Thailand’s tropical climate.
The photo shows a pantry room of a company that occupies an entire floor. With a whole floor, customization options are wide, and large spaces for employee dining can be arranged.
The smoking area is accessible from the 1st floor outdoor space. Inspired by Siam Motors’ “Think Earth” concept, this green space is also open to the public and serves as a relaxing area for stress relief.
A Lawson convenience store is located on the 1st floor, and a café is on the 2nd floor, allowing tenants and visitors to conveniently purchase light meals and drinks without leaving the building.
• 719 vehicle parking spaces (16 EV charging stations available)
• Additional parking space: 3,000 Baht / per vehicle
That concludes our introduction to Siam Patumwan House!
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Bangkok Office Navi Team
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