Red Flag? Tri-Plex for sell but is not currently occupied.

[Shawn Speelman]

I'm new to this so I don't know. A property I'm currently looking at supposedly has a history of rents of 2000/m income. The realtor selling the property says that the owner just wanted it empty to sell. Does this make sense? I'm sure that I'm just being over cautious but since it will be the first income producing property I have owned I  don't need any surprises. 

Thanks!