I believe it would depend on what the primary purpose for the property is. Is the primary purpose for dwelling, or for horse stalls? If the "2 small rentals" are dwellings (i.e. residential rental homes), then that could still be HMDA reportable. The good news is that since you have a business borrrower, the collection of GMI is not applicable.
This is one of those deals that's not black and white, so I would recomend that whatever decision is made (whether HMDA reportable or not) that you clearly document the loan file what your decision was and support why you made that decision.
_________________________
Say what you mean, mean what you say, but don't say it mean.