It is not so common that a massage shop is located inside an office building. Zentana Spa is located on the 3rd floor of a small office building on Sukhumvit soi 33: Walk past Basilico restaurant and enter the small building on the right hand side. Take the lift to the 3rd floor and the small but very nice shop is on your right.
It is a brand new shop with nice and comfortable rooms. They have a small staff of 2-3 ladies and 1 lady boy and they offer legitimate massages, but I heard that sometimes more than a massage happens there. And even if it is only a massage, it’s a good one! 😉
They currently have a promotion: 1 hour Thai Massage for 250 baht.
Allow me to list this shop with the naughty massage shops.