The most recent Live Letter during E3 has confirmed that the sale of housing for profit is not allowed, and that the sale of in-game housing for in-game currency is actionable by Final Fantasy XIV GMs.
Threads advertising the sale of an in-game house or lot in any section of the RPC forums are no longer permitted and will be archived at moderator discretion.
After further consideration and examination and complete failure to find a definitive answer from Square Enix on the subject, threads advertising the sale of housing are temporarily suspended until the official transcription of the Live Letter is available.
EDIT: In the wake of the automatic housing demolition, any requests for housing (whether or not it is for resale) are not permitted and will be removed at moderator discretion.
Threads advertising the sale of an in-game house or lot in any section of the RPC forums are no longer permitted and will be archived at moderator discretion.
After further consideration and examination and complete failure to find a definitive answer from Square Enix on the subject, threads advertising the sale of housing are temporarily suspended until the official transcription of the Live Letter is available.
EDIT: In the wake of the automatic housing demolition, any requests for housing (whether or not it is for resale) are not permitted and will be removed at moderator discretion.