I asked my contractor and it would cost a lot to separate heat for each floor.

When you're get paid - you need a license if it's not your property.LLC is not you, it's a separate entity.

It is really two separate products- the 100% Financing System and the flip funding.

My husband and I plan on making the move to Boston once he is separated from the military in the spring.

Or do I need separate LLC for each rental?  

If you want someone to put a bed down there and live, then regardless of whether or not it is a completely separate unit, for separate renters, you have to bring the unit up to code (and meet the zoning requirement).

On my duplex, the water is not split (electric and gas are separately metered.)

Origination charge being an example, but 1% on one property at $500k versus 1% on two properties at $250k/each...You still need separate appraisals, title work, filing fees (state/county/city) so trying to find a lender to bundle properties into a single loan likely won't fare you any better than just finding a good lender.

Considering you have all your rentails in the same area, are they considered one business or have to be considered for tax purpose separate.  

We bought a 117 year old duplex with a separate garage with apartment.