What is the fine-grained topic of the following text: The most popular regions, that generate the greatest interest from investors and private buyers are Bangkok, Phuket, Pattaya, Hua Hin, Koh Samui and Chiang Mai, while most of the House units In Koh Samui are off the market 145 days after they have been listed For Sale on Thaiger Property. Only return the topic.
Real estate market in Thailand