Some families don't like basement. Some prefer the guest room to have its attached bathroom, some don't. There are houses with a powder room and there are those without. Units are owned by several owners. Semi-detached and terraces generally have a small car porch sufficient to park one car and a similar small plot of garden to the side.
Some houses have a big basement which can be used as a storage or games room.
Walking distance to the American School. There is a greater demand for detached houses with pool. There are around 3,000 students in the Singapore American School. This is the estimated enrolment. Therefore, the supply of houses will need to exceed 1,000 units to reduce the rent asked.