Overview
The Monument Thong Lo is a towering monolith of luxury, standing 177 meters tall at the prestigious northern tip of Thonglor. Completed in 2019 as part of Sansiri’s Luxury Collection, the project is defined by the mantra "Luxury is Space." With only 127 units across 45 floors, it offers massive floor plates that are increasingly rare in modern Bangkok developments, starting at 124 sqm for a two-bedroom residence.
The building is famous for its architectural sculpture and the iconic 28-meter swimming pool finished in rare White Cloud marble. In 2026, it remains a landmark of the Watthana district, uniquely combining the service standards of a 5-star hotel—including a butler team trained by the British Butler Institute—with the privacy of a low-density residential tower.
Developer
Sansiri Public Company Limited is Thailand's premier luxury developer. The Monument Thong Lo is one of their four flagship "Luxury Collection" projects (alongside 98 Wireless). The project features ultra-premium materials like Petra Grey marble floors and Arabescato marble walls. Building management is handled to the highest standard, with a common area fee (CAM) of 95 THB/sqm, covering the bespoke butler, valet, and navigator services.
Location & Transit
| Station | Line | Distance | Mode |
|---|---|---|---|
| BTS Thong Lo | Sukhumvit | 2.2km | Shuttle (10 min) |
| Camillian Hospital | Medical | 500m | Walk (6 min) |
| The Commons | Lifestyle | 850m | Walk (10 min) |
Commute Logistics:
- Upper Thonglor Advantage: While the BTS is not walkable, the project's location near the Phetchaburi intersection allows residents to exit the Thonglor area significantly faster than those living in the congested mid-soi sections.
- Elite Transport: Residents rely on the building’s Navigator shuttle service and private limousine service for transit to the BTS or local premium malls like EmQuartier.
- Sound Insulation: Despite being on a major road, the tower is "cloaked" in light-reflecting, triple-glazed Low-E glass, providing complete acoustic isolation from the street below.
Building Facts
| Developer | Sansiri PCL |
| Completed | 2019 |
| Floors | 45 |
| Units | 127 |
| Ownership | Freehold |
Unit Types
| Type | Size | Notes |
|---|---|---|
| 2 Bedroom | 124.3 sqm | All units feature private lifts and oversized living areas. |
| 3 Bedroom | 252.3 sqm | Includes separate Thai kitchen, maid's room, and 360° views. |
| Penthouse | 508 - 662 sqm | The "Palatial" collection; some units include private pools. |
Facilities
The Iconic Pool: A 28-meter long architectural marvel on the 2nd floor, constructed from White Cloud marble, designed to look like an oasis floating amidst the city skyline.
Botanical Sanctuary: The project preserved massive 50-year-old Jamjuree trees on the site, creating a 1,000 sqm front garden that mimics a traditional heritage home's entrance. It also features a dedicated Dog Park and an outdoor tree house for children.
Professional Wellness: The Fitness Center is equipped with world-class Technogym gear, complemented by a private yoga room and high-spec steam rooms.
Pros
- True Luxury Space — Unrivaled unit sizes for the Thonglor district.
- Pet-Friendly Pioneer — One of the best high-rise environments for large dogs (up to 20kg).
- Exceptional Service — Professional butler, valet, and specialized "Healthologist" services.
- Superior Privacy — Maximum of 4 units per floor and 192% parking ratio.
Cons
- Distance to BTS — Requires a shuttle or vehicle for all rail transit.
- High Maintenance — CAM fees are premium, reflecting the level of service staff.
- Traffic — The Phetchaburi/Thonglor intersection is notoriously busy at peak hours.
The Bottom Line
In 2026, The Monument Thong Lo is the "Palace in the Sky." It is the perfect choice for affluent families and pet owners who demand house-like proportions with the security and services of a world-class skyscraper. If you prioritize space, privacy, and specialized butler services over being within walking distance of the BTS, this is the definitive super-luxury asset in Thonglor.