In India kotha, correct meaning is rooftop and is used for the same meaning especially in and around Lucknow region. Since tawaif (courtesan) used to practice music and dance on the balcony / rooftop (kotha) this word became a type of synonym to a brothel.
This disambiguation page lists articles about distinct geographical locations with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article.