Same thing as Bankrate for example they use a very specific model to price those rates and scenarios like 740 Fico, 70LTV, 15 year term and the APR is never really talked about when it comes to margin and points charged.So when your fico score, LTV, loan size or DTI deviates from that very specific loan scenario then they say in all websites required by law "rates are subject to change" hint hint! 

Quote from @Arvand Sabetian: Depends on your unit and size.

Beneficial Ownership Information is back on the table.

I’m looking to connect with:Partners who can bring resources or experience to the table while I handle the heavy lifting of deal-finding, analysis, and management.Investors interested in deals with clear strategies and long-term potential.While I’d prefer to build a portfolio for the long haul, I understand the market always has buyers.

For example , the rental amount doesn’t depend on number of bathrooms, garage, basement status or property size.

You can make minor adjustments based on the type of appliances (dishwasher, clothes washer and dryer, air conditioning, etc.) and the size of the rental.

Don't leave this option OFF the table. 

Generally:Minimum size: Most jurisdictions consider a minimum of 70 square feet of floor space.

What are some companies that others are using to insure multi-families of this size?

If so, as @Brandon Weis mentioned, they come in all "shapes & sizes".You'll get more assistance if you post an example here and ask more specific questions about it:)