As interests become divided, so do income/expenses in proportion. 

I assumed I could just multiply the interest rate to the loan amount and divide by the length of the mortgage.

When they rent the house the garage is not included , Its divided in 2 , if its available they can rent a side .

Any net profits of the LLC would be divided among the various owners based on percentage of ownership.

But without a partnership return, all rentals showing up on your personal 1040 sched Es, the best I've heard and DO, is add up all the business expenses, marketing expenses, education, REIA dues (and milage driving to the REIA meetings) etc etc and divide by the number of houses and put that as an expense on EACH house called "business operations expense".I don;t like this solution but it's what I do and what I've heard others do.  

Briefly, the engineer will divide your asset purchase price among the various components (kitchens, sewers, walls, roof, etc) and some of those items have shorter depreciation periods (carpets, for example).

This is the net operating income divided by the P&I payment.

How do I find out if it can be divided and sold in smaller increments.

The percentage of profit is determined by the average loan amount over the last 12 months divided by original cost times the profit.

donno a whole lot on this but we have been signing 5-7 yr leases for drilling rights for over 50 years on our land. last time they asked to only renew it for 2 years and paid us 5k, no one has ever drilled though. my immiediate family, as well as my cusins and neighbors all are on top of the same natural gas and divide up the royalties if they ever find anything on any of our properties, we get 1/16 no matter were they drill, becuase we are on 1/16 of the reserve. if you sell your property and you think there is natural gas keep your mineral rights as long as you can!