real estate transaction agent; licensed real estate broker
Abbreviation of 宅地建物取引士. Refers to the qualification or the person holding it. Commonly used in contexts like 宅建試験 (the exam) or 宅建業者 (real estate agent).
See also: 宅地建物取引主任者
He obtained his real estate transaction agent license this year.
The real estate agent exam is held every October.