How to Analyze a Multi Building Multifamily

[Jim Webster]

So far, I've been using the BP calculators to analyze single family homes.  Recently ran across a multi building, multifamily package deal that promises a great return (by the realtor) to an investor.  It's made up of triplexes, 4-plexes, and apartments.  Total 42 doors.  

My question: What, if anything, is different when analyzing multifamily projects than single family homes.

Thanks for your input, any guidance is greatly appreciated.