Siam Penthouse 1

Siam Penthouse 1 is a high-rise condominium located at 51 Khlong Tan, Khlong Toei, Bangkok 10110, in the central Sukhumvit area with convenient access to Asok, Phrom Phong, and Thong Lo. The project is approximately 1.6 km from BTS Phrom Phong and around 1.7 km from BTS Thong Lo, making it suitable for residents seeking a quieter residential atmosphere in Sukhumvit.

The project was completed around 1982 and consists of 1 residential building with 10 floors and approximately 33 units. With a limited number of units, the living environment is relatively private and calm. Unit layouts mainly feature large 2-4 bedroom residences, suitable for families or buyers who prefer spacious living areas. Publicly confirmed information on the original developer and exact parking ratio is not clearly available.

Main facilities include a swimming pool, passenger lift, parking area, and common residential spaces designed for practical everyday living. Security features include controlled access and on-site building staff in line with standard condominium operations. Project management is handled by the condominium juristic person responsible for common area maintenance and building systems.

The key appeal of Siam Penthouse 1 is its large unit sizes and established Sukhumvit 8 location, close to lifestyle destinations, international schools, and office buildings. It is suitable for both owner-occupiers and investors targeting expatriate family rentals. For a nearby condominium in the Sukhumvit - Thong Lo area, see Ivy Thonglor.

Siam Penthouse 1 (Khlong Toei, Bangkok) shows a “stable to mildly rising” pattern in 2026, supported by tenant demand from the Sukhumvit-Rama 4 business belt and the limited supply of larger units near the CBD.

• Resale price per unit: a typical 2-bedroom around 85 sq.m. averages THB 11.5M
• Price per sq.m.: average THB 135,000 per sq.m. (commonly seen range THB 120,000-155,000 depending on renovation and view)
• Average rent: THB 45,000 per month for a 2-bedroom

Rental Yield (2026): simplified method = (annual rent ÷ purchase price) x 100 = (45,000 x 12 ÷ 11,500,000) x 100 = 4.70% p.a. before common fees and taxes. This suits investors seeking moderate cashflow with relatively steady long-stay tenants.

Capital Gain outlook: using an estimated 2024 market level of ~THB 128,000 per sq.m. rising to THB 135,000 per sq.m. in 2026 implies about +5.5% over two years, or roughly 2.7% per year. Upside is driven more by location resilience (Khlong Toei connecting Sukhumvit and Rama 4) than hype, while nearby projects such as Noble Ploenchit and Siri at Sukhumvit set a competitive benchmark that keeps appreciation gradual and realistic.