4bd family home turned into a 3bd family house

[Aida Rivera]

I'm looking into making an offer on a lovely use to be 4bd single family home, however, it's now a 3bd family house the owner actually made the room into an office but it still has a bathroom in the room. What they actually did was remove the closet and kept the bathroom so it's now a office with a bathroom. So before the change it use to be a 4bd (2 master rooms) because 2 of the rooms had bathrooms. So I'm really having a hard time (being that I'm new to wholesaling) assessing the value to this property. I've done some research and I pretty much been doing comps on 3bd instead of 4, is that right? can someone please help out. I'm really looking to make an offer the owner is waiting on my call.