Anantara Siam Bangkok is one of Bangkok’s original grand hotels. It stands on Ratchadamri Road next to the BTS Skytrain, facing the golf course of the Royal Bangkok Sports Club. It opened in 1983 and was Four Seasons Bangkok until 2015. Minor International owns it and runs it as Anantara Siam, the brand’s flagship in Thailand. For owners and investors, Anantara Siam matters for two reasons: it sits on leased Crown land, and it has just spent US$50m to stay in the luxury tier as new hotels open around it.
Key facts
| Item | Detail |
|---|---|
| Address | 155 Rajadamri Road, Pathum Wan, Bangkok |
| Keys | 335 rooms, suites and villas (354 before the renovation) |
| Opened | 15 April 1983 |
| Owner | Rajadamri Hotel PCL (Minor International, 99.22% in 2016) |
| Operator | Minor Hotels, Anantara brand |
| Previous names | The Regent Bangkok; Four Seasons Hotel Bangkok |
| Rebranded | March 2015 |
| Land | Leased from the Crown Property Bureau (formerly the Privy Purse Bureau) |
| Renovation | US$50m, June 2025 to September 2026 |
| Events | Grand Ballroom (814 sq m, up to 700 guests before the renovation) and 17 breakout rooms |
Who owns Anantara Siam
The owner is Rajadamri Hotel Public Company Limited. Minor delisted it from the Stock Exchange of Thailand in 2007. Minor’s accounts for 2016 show a 99.22% holding.
The company opened the hotel in 1983 as The Bangkok Peninsula, on land leased from the Privy Purse Bureau. Its early shareholders included Thai Farmers Bank, the Crown Property Bureau, HSBC and Swire. It became The Regent Bangkok in 1985 and Four Seasons Hotel Bangkok in 2003, according to the company’s 2007 tender offer filing. Minor and its subsidiary held 95.8% by then.
In March 2015 Minor ended the Four Seasons arrangement and moved the hotel to its own Anantara brand. Minor now earns both the owner’s profit and the management fee.
The land lease
The hotel stands on two plots leased from the Privy Purse Bureau, now the Crown Property Bureau, according to the 2007 filing:
- The main plot, about 8.5 rai, leased for 30 years from 1 July 1983, with two 15-year renewal options. The three main buildings stand here.
- An adjoining plot of about 2 rai, leased from 1990 for 23 years and six months, on the same renewal terms. The ballrooms and a car park stand here.
The independent adviser’s model in 2007 assumed both renewals, which would run the lease to about 2043. We have not found the current terms published by Minor or the Crown Property Bureau.
Our view: a US$50m renovation only makes sense with a long runway. We read it as a strong sign that Minor has secured, or expects to secure, more time on the land. That is our inference, not a disclosed fact.
The US$50m renovation
The hotel stayed open through a two-phase renovation from June 2025 to September 2026, according to Business Traveller. Every room, suite and villa was redone. Keys fell from 354 to 335 as new Garden Pool Suites and Villas, with private pools in the gardens, were added.
By our calculation, US$50m across 335 keys is about US$149,000 per key. That covers public areas, the spa and meeting space as well as rooms.
The work finished just before the IMF and World Bank Annual Meetings in Bangkok in October 2026, which were expected to bring 15,000 to 25,000 delegates to the city.
Where it sits in Bangkok’s luxury set
| Anantara Siam | The Okura Prestige | Rosewood Bangkok | The Peninsula Bangkok | |
|---|---|---|---|---|
| Keys | 335 | 240 | 158 | 370 |
| Opened | 1983 | 2012 | 2019 | 1998 |
| Owner | Minor (Rajadamri Hotel) | AWC (leasehold) | Rende Development | HSH (freehold) |
| Operator | Minor (Anantara) | Okura | Rosewood | Peninsula (self) |
See our profiles of The Okura Prestige Bangkok, Rosewood Bangkok and The Peninsula Bangkok.
Its direct neighbours on Ratchadamri are The St. Regis Bangkok and the InterContinental Bangkok. All three sell location, meeting space and the Skytrain. Anantara Siam’s edge is its gardens, which no tower hotel nearby can copy.
Bangkok’s luxury market is getting tighter. Occupancy held at 70% in the third quarter but rates slipped; see our report on Bangkok hotel occupancy in Q3. Owners are also reshuffling assets: the Royal Orchid Sheraton sale and AWC’s Ruby Hotel Bangkok conversion both show capital moving. And the other Thai owner-operator, Dusit Thani, has rebuilt its own Bangkok flagship.
What it means for you
1. Owners on leased land
Anantara Siam shows how a long lease with renewal options can support big reinvestment. Know your renewal terms before you plan capital spending.
2. Investors
Owner-operators like Minor keep the whole margin but carry all the risk. Ask how much of the renovation will be recovered through rate, not occupancy.
3. Competing hotels on Ratchadamri and Ploenchit
A fully renovated 335-key hotel with a big ballroom is back in the market. Expect stronger competition for MICE and weddings in 2027.
4. Brands
Minor took this hotel from Four Seasons in 2015 and invested in its own brand. Brands managing for owners who also run hotels should expect the same.
FAQ
Who owns Anantara Siam Bangkok?
Rajadamri Hotel Public Company Limited, a subsidiary of Minor International. Minor’s 2016 accounts show a 99.22% holding.
Who operates Anantara Siam Bangkok?
Minor Hotels, under its Anantara brand.
Was Anantara Siam the Four Seasons Bangkok?
Yes. The hotel opened in 1983, was run as The Regent and then Four Seasons Bangkok, and became Anantara Siam in March 2015.
How many rooms does Anantara Siam Bangkok have?
335 rooms, suites and villas after the renovation finished in September 2026. It had 354 before.
Is the land owned or leased?
Leased from the Crown Property Bureau. The current lease term has not been published.