"Off the Market" generally means the property is not available for sale at this time. This situation could be temporary or permanent. I would suggest that if this term is being used in regards to a property that you have interest in, you contact the listing agent for more information. If you have a buyer's agent that is representing you, have your agent make contact on your behalf. A home could be pulled from the market for a variety of reasons such as health, finances, issues related to the property or title, etc. If the home becomes available again in the future, and you've expressed interest, there is a good chance that the listing agent would contact you or your agent.