I understand there are other factors such as pitch etc. but i am trying to get ballpark range. 

The loan on a property shouldn’t factor into the taxes.

Will factor this in our decision making process.

What are some key factors to consider?

If the rate is reasonable then it may make sense to try to save fast to get to the 3.5% down payment on a double or triple - househacking may allow you to increase your savings rate and pay down that loan even faster.As for estimating costs, closing in NY factor at least 1% of the mortgage amount for tax, plus $1500-2000 for lawyer, title and fees, then the amount required by the bank for escrow will depend on the actual property taxes and insurance.

Now some choose to do it with TK companies and give up the control factor that you have with your investments.

That curriculum you are following was designed for you by the school this way. 

I forgot how the book ends but one of the high points was his design of a chapel "for the worship of God and the service of Man".

and yes, of course your budget needs to be able to factor that in. 

This was all done by design.