Sathorn is Bangkok's old money district, and it has never needed a headline to justify its price tag. Five generations of families have left their mark here, from old churches and old embassies to old colonial era houses, and even as glass towers close in around them, that settled, unhurried sense of order has never quite been diluted. For all its CBD credentials, Sathorn moves at a slower pace than Sukhumvit: less retail strip bustle, more of the composure that comes with sitting inside an embassy quarter. It's also, not coincidentally, one of Bangkok's fastest appreciating submarkets in recent years. Land here was scarce to begin with, and freehold title on it is rarer still.
On Sathorn Soi 10, under a 55-year-old pink trumpet tree, The Monument Sathorn has just returned to market.
What Is The Monument Sathorn?
The Monument is Sansiri's legacy condominium brand, dormant for a decade. The name last surfaced when Sanampao sold out on its first day of pre-sale, and when Thonglor delivered what's still regarded as a benchmark freehold address in the neighborhood. Ten years on, the brand's third project lands in the heart of Sathorn, this time backed by a new layer of credibility: Sansiri's first strategic joint venture with Nomura Real Estate (Thailand), a 55:45 partnership behind a project valued at roughly THB 4.5 billion.
The concept is stated plainly: Monument of Nature and Heritage. One thread is Sathorn's original natural landscape; the other is the accumulated memory of Sathorn Soi 10 itself. Both are woven into the architecture, landscaping and interiors. The more than 50-year-old pink trumpet tree at the entrance has been preserved intact, the one piece of the site's history that simply cannot be recreated.
Twenty-nine storeys, just 185 units, freehold title, Pets Welcome, and a parking ratio above 102%. Taken together, the numbers point to one thing: this isn't a project built for fast turnover. It's a low density building built for people who intend to stay.
Project Information & Unit Types
📋 Project Information
Location: Sathon Soi 10
Land area: approx. 1 rai
Total Floor: 29 storeys
Total units: 185
Title: Freehold
Parking ratio: 102% (all conventional parking)
Price range: THB 9.9 million to 150 million
🏠 Unit Types
1 Bedroom | 39.00 to 69.25 sq.m. (plus a 1 Bedroom Plus at 74.50 sq.m.)
2 Bedroom | 80.25 to 108.75 sq.m.
3 Bedroom | 130.75 to 201.75 sq.m.
Penthouse | 240.00 to 303.00 sq.m. (only 2 units in the entire building)
At 185 units on a site this central, the building is genuinely low density, and the unit sizes skew noticeably large. This is a project built for high end families, not a high turnover investment product. The amenities are stacked across floors 25 to 29: swimming pool, kids' pool, hydrotherapy pool and jacuzzi, gym, pilates studio, onsen and cold shower therapy, a study and drawing room, a children's playground, and on the 29th floor, a private dining room and rooftop garden. The Canopy is a backyard built 29 storeys above the city.
Five Highlights Worth Knowing
1. One of the few new Sathorn launches with Mahanakhon views
New freehold projects have been rare in Sathorn's core in recent years, and The Monument Sathorn is one of the few. The site and floor plates are positioned so that select units on the middle and upper floors frame views of King Power Mahanakhon, Thailand's tallest building. A skyline asset like this is genuinely hard to come by in this part of the CBD.
2. Pets Welcome: the debut of SANSIRI PAW & CO.
The Monument Sathorn is the first project to carry SANSIRI PAW & CO., Sansiri's new concept for people and pets living well together. It turns pet ownership from something you accommodate into something the building is actually designed around: a Pet Sky Lounge, a Pet Sky Park, and a Pet Grooming & Spa, all connected within the sky facilities, complete with outdoor lawns, water stations and a wash area. For families who care about quality of life and don't want to compromise on keeping pets in the city center, it's a more complete offering than most.
3. Sansiri's legacy brand, The Monument, back after a decade
Sanampao sold out on launch day; Thonglor is still considered a benchmark freehold address in its neighborhood. The Monument doesn't need an introduction in this market. This time, Sansiri has brought in Nomura Real Estate, nearly a decade into its Thailand track record and known for its KAIZEN approach to quality, as a strategic joint venture partner for the first time, at a 55:45 split. Local development and design expertise on one side, Japanese quality discipline on the other. For long term holders, that combination offers an extra layer of confidence.
4. Low density: just 185 units, freehold, 102%+ parking
Fully developable plots are scarce in Sathorn, and much of the land has long been held by institutions, churches and embassies. The developer describes this site as one of the rarest remaining in the district. Only 185 units are planned across 29 floors, the title is freehold, and parking runs above 102%, meaning no resident has to compete for a space. Unit sizes have deliberately been pushed larger too, aimed squarely at owner occupier families rather than high turnover investors.
5. 80 metres to BTS Saint Louis
Set back on Soi 10, the building still sits roughly 80 metres from BTS Saint Louis, under a minute's walk, while avoiding the traffic and noise of Sathon Road itself. That combination of a quiet soi and strong CBD connectivity is rare in this part of Sathorn, and hard to replicate.
Location: Sathorn's Core, from Its Quietest Corner
🚆 Transport
BTS Saint Louis: ~80 m
Silom Road: ~500 m
Si Rat Expressway: ~1.7 km
🏢 Office Towers
Empire Tower, Sathorn Square, AIA Sathorn Tower, Park Silom, Central Park Offices
🏛 Embassies
More than 10 within the surrounding area, including the British, Australian, German and Singaporean embassies
🏫 Schools
Bangkok Christian College
Assumption College
🏥 Healthcare
Saint Louis Hospital
BNH Hospital
🌳 Shopping malls and parks
Dusit Central Park: ~1.7 km, reachable via BTS Sala Daeng. Bangkok's newest mixed use landmark, it combines a rooftop garden, upscale retail and the returning Dusit Thani hotel under one roof.
Silom Complex: ~1.3 km
Lumphini Park: ~1.5 km, Bangkok's largest inner city green space, walkable or a short drive away
Sathorn Square, Empire Tower, AIA Sathorn Tower: an established office and F&B catchment, all within walking distance
This list will look familiar, since it's essentially the full lifestyle map of the Silom-Sathorn corridor. The difference is where The Monument Sathorn actually sits: tucked into Soi 10, 80 metres from the BTS, without having to face Sathon Road's traffic and noise directly. That's the "quiet within the busy" coordinate that's genuinely hard to find in Sathorn's core.
Why It's Worth Watching
Sathorn's scarcity was never manufactured by hype. It's structural, a straightforward shortage of land, and a brand new freehold launch in the core soi network is already an uncommon event these days. The Monument Sathorn brings together a landmark view, a pet friendly concept, brand pedigree, low density freehold living and an 80 metre BTS commute. Along the Silom-Sathorn corridor, that combination makes it one of the more serious projects to study right now.
📩 To learn more, please reach out to Upper Estates:
Launch timing and floor/unit recommendations for The Monument Sathorn
A side by side comparison with ROMM Convent, Upper House and other Sathorn-Silom corridor projects
Guidance on unit size and orientation for owner occupier vs. investment purposes
The foreign buyer purchase process and freehold considerations
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