2 6 plexes and a 5 plex deal

[Adam McCarty]

So I am a trying to figure out good percentage rates for maintenance, cap expenses, and vacancy rates on this deal and just looking for advice.  These buildings have boiler systems which i have no experience with.  They are converted single family homes that seem like they are in ok shape for their age which is 120+ years old.  It seems like a good deal but it all depends on what these expenses will be.  Any advice is welcome.  

Thanks