Apologies first for such amateur question: in new developments, when construction companies quote construction cost for "$ X/sf", is this number usually "the total construction cost divided by living square foot ONLY" or "the totally construction cost divided by total square footage of the structure, for example, including garage (sf that are not counted when selling to buyer)"? 

It states that one month’s rent divided by the all-in purchase price should be 1% (.01) or better.

The metroplex is pretty broad, so we tend to divide ourselves that way.

I live in a house divided into 3 apartments - and between the three tenants, we are paying between $800 and $1000 a month for heat!

$2,000.00 divided by 360 (days in the year) divided by the loan amount will give you the interest factor.Normally you would compute the loan amount X the loan interest factor or rate, times 360 to arrive at the annual interest charged.If you are doing private financing I suggest you seek out a mortgage broker or loan originator to assist both of you in this.

I rent out roughly 40% of my house on Airbnb (it's divided by door, has its own open kitchen living area, bathroom, bedroom).

You divide by 2 years to get your percentage of the total exclusion: # Months Primary Residence / 24 = Percentage applied to exclusion# Days Primary Residence / 730 = Percentage applied to exclusionI'd recommend touching base with a tax professional just to be sure you are able to take the exclusion and how to calculate it correctly per your situation.

We divide these into two categories: 4 units or less and more than 4 units.

I am trying to figure out how to pay the other half of the purchase price with personal cash, and am assuming the land would have to be divided: 1/2 owned by the IRA and can't be touched by me, and the other 1/2 owned by me free and clear.Presumably I would need the seller to get it divided in advance of the sale.

And then the administrator divides up money and pays people or creditors or heirs or whoever.