The Monument Thonglor

The Monument Thonglor is a luxury high-rise condominium located at 998/25 Soi Sukhumvit 55, Khlong Tan Nuea, Watthana, Bangkok 10110. Positioned in the heart of Thonglor, the project is surrounded by upscale dining venues, international schools, and lifestyle destinations. It offers convenient access to Sukhumvit Road and Phetchaburi Road, and is approximately 2 kilometers from BTS Thong Lo Station.

Developed by Sansiri Public Company Limited and completed in 2019, the project consists of 1 residential tower with 45 floors and a total of 127 units. Parking is available for approximately 177 cars, which is more than 100% of the unit count. Unit types include 2-bedroom, 3-bedroom, penthouse, and duplex layouts, with large living spaces designed for privacy and premium urban living.

Facilities include a saltwater swimming pool, fitness center, yoga room, multipurpose room, residents' lounge, children's area, playground, and private lift lobby. The project also offers selected concierge-style services in line with a luxury residential concept. Security features include 24-hour security personnel, CCTV, key card access, and controlled private access points throughout the building.

The property is managed by the condominium juristic person, ensuring proper maintenance of common areas and smooth day-to-day operations. The Monument Thonglor is well suited for buyers seeking a high-end residence in Thonglor, as well as investors looking for long-term value in one of Bangkok's most established residential neighborhoods.

The Monument Thonglor (Sukhumvit 55) remains a high-end condominium where 2026 resale pricing is supported by genuine end-users and expatriate executive tenants. Prices tend to be stable rather than volatile, though liquidity is typically lower than mass-market condos in the broader Thonglor area. The project is about 1.6 km from BTS Thong Lo, so daily access is usually by car or shuttle within the soi.

• Resale price per unit: 2-bedroom 125 sq.m. averages THB 38.5M
• Price per sq.m.: ~THB 308,000/sq.m. (commonly seen ~THB 280,000-340,000)
• Average rent: THB 155,000/month for 2-bedroom 120-130 sq.m.

Rental Yield (quick math): annual rent THB 155,000 x 12 = THB 1,860,000. Divide by purchase price THB 38,500,000 = ~4.83% gross yield per year (before common fees, tax, vacancy). This is relatively strong for luxury Thonglor stock, where many projects sit closer to 3-4%.

Capital Gain view: assuming upper-Thonglor luxury pricing grows gradually at ~2-4% per year, the sample unit could move to roughly THB 39.3-40.0M over the next 12 months. The trade-off is a smaller buyer pool due to a high ticket size and limited units, meaning longer resale timelines than projects like Ivy Thonglor. The upside is consistent demand for large layouts from premium tenants.