Answered
What is Tonson One Residence?
Tonson One Residence is a freehold condominium on Soi Tonson, a quiet lane off Langsuan near Lumphini Park, developed by Asset Five Group: a low‑density 29‑floor tower completed in 2023, and one of the few freehold buildings on a stretch of the park‑axis that is otherwise leasehold.

At a glance
- Freehold
- Completed 2023
- Lumphini park‑axis
- 14 for sale with us
Freehold on this stretch is the point. Most of the land around Langsuan and Tonson is leasehold, so a freehold title here is the exception rather than the norm, and it is the first thing a buyer comparing the lane should establish.
Read the rest of the answer
Published sources give the unit count as anywhere between 80 and 126, so we do not state one. What is settled is that it is a low‑density 29‑floor building completed in 2023, on a lane rather than a main road.
Embark advises on resale and rental here, on the buyer side, and confirms a specific unit's title and quota status privately.
How we know this
Asset Five Group's own project record, and Embark's observed ledger for the Lumphini park‑axis. Unit count deliberately not stated: sources disagree.
