The Monument Sathon

The location is unusually easy to understand without a long list of landmarks. Sansiri states roughly 80 metres to Saint Louis BTS, about 600 metres to Chong Nonsi and 850 metres to Surasak. Saint Louis Hospital is listed at about 400 metres and Bangkok Christian College at about 650 metres. Sathon Soi 10 is a relatively short lane off the main business corridor, so the building can sit close to offices and rail without putting its front door directly on a major traffic artery. The trade-off is that this remains central Bangkok: weekday traffic, neighbouring development and the exact outlook from each stack will matter. A city view on a high floor and a lower-floor orientation toward a future site are not the same purchase even when the floor plan is identical.

The plan mix is one of the more useful parts of the project data. Standard one-bedrooms run from 39 to 69.25 sqm, followed by a 74.5 sqm one-bedroom-plus. Two-bedroom residences range from 80.25 to 108.75 sqm, while three-bedroom homes run from 130.75 to 201.75 sqm. The two penthouses are 240 and 303 sqm. This creates real steps between household sizes instead of forcing a buyer to jump from a compact apartment straight to a trophy unit. Availability is the moving part. Sales have been released by floor rather than as one permanent inventory list, so a plan shown in the brochure may not be available when a buyer asks. The relevant document at reservation is the live unit schedule for the actual released floors.

Pricing needs the same separation between headline, live stock and contract. Sansiri launched the project from THB 9.9 million in August 2026, with the published range extending to around THB 150 million. On 24 September 2026, an active DDproperty listing showed a 40 sqm one-bedroom at THB 8.9 million. We use that only as a lower market anchor, not as the project's official price. Agent incentives, limited units or launch campaigns can produce a number that is real for one residence and irrelevant to the next. The useful comparison is therefore unit by unit: area, floor, aspect, foreign quota status, payment milestones, recurring charges and what is actually included in the sale contract.

The payment schedule circulating in August 2026 is straightforward on paper: a booking amount that rises with unit size, 30% under the contract within 15 days of booking and 70% at handover. That structure leaves most of the purchase price until the end, but it still puts a meaningful deposit at risk during a multi-year construction period. The same sales material states a common fee of THB 95 per sqm per month for the first two years, rising to THB 110 thereafter, plus a one-time sinking fund contribution of THB 800 per sqm. On a large three-bedroom or penthouse these are not token amounts. They belong in the ownership budget alongside furnishing, taxes, insurance and the cost of holding a property that will not be usable before handover.

The biggest open questions are document questions rather than identity questions. Fresh market sources do not agree on completion, with some portals still showing 2028 or 2029 while the latest sales material cited by specialist sources states Q1 2030. This dossier uses Q1 2030 as the working handover target, but the date that matters is the one written into the reservation and sale-and-purchase documents. There is also a notable primary-source discrepancy over the site area: Sansiri's public project page says approximately one rai, while Nomura's official release states 2,834 sqm. We do not average those figures or choose the one that reads better, and we leave land area out of the core project record until the discrepancy is resolved from project documents.