Is it OK to say off of

It is certainly true that the compound preposition off of is used in English, but it is considered an idiomatic or dialectal usage, as is out of. The of is often criticized as redundant or superfluous, but that is not a concern when the writer or speaker is using the phrase idiomatically (i.e., informally). In more formal writing, you would say, "The actress stepped off the stage," but in informal speech or writing you could say, "The actress stepped off of the stage." However, the use of off of when intended to mean 'from' as in "I borrowed five dollars off of him," is considered non-standard. The construction off of is more common in American English than in British English. Other compound prepositions to which this information may be applied are: inside of, out of, outside of. In other words, you can say, "He waited outside the building" or "He waited outside of the building."