It keeps things simple and guarantees that you will have  atleast one good renter for your first investment property :)As far as combining your money, I would not- only because I have siblings and I don't want to complicate things or make things ugly when my parent would die. 

Sibling continues to pay mortgage for the next 7 years, creating a $500K equity spread.

Although I Iive in New Jersey, USA, my grandfather (along with his parents and siblings) came to the US from Sweden!

My mother and her siblings are currently going through the heirship process for property left to them after my grandmother's passing.

Me and my siblings are tight and have always had eachothers backs and they  rent right now for some not so good tenants.

Room for couple of siblings, their kids, and the grandparents.  

I'm new to the community, and I was hoping to attain some advice.My sibling and I are going to acquire a small office building, which will be leased to tenants.My sibling solely provides the capital for acquisition, which will be an all cash deal with no financing (I know that an investor can diversify into more properties by being open to leverage, but it's my sibling's decision).

Say I have a holding/parent LLC, which is the single-owner of a few sub-LLCs, each of which owns several properties from the state where it was created.Each sub-LLC needs its own EIN & checking account, ofc, so it's a clearly separate entity (to achieve the isolation goals vs it's 'siblings') and is listed on the titles to the properties it owns.Do you generally have the sub-LLCs also be named on the mortgages for those properties, pay for maintenance and capExp, and receive rent from it's checking act/CC, and hence that's one set of books in QBO?

Do you have any siblings as this could get messy. 

Liquidity ratios are less viable as RE isn't considered a liquid asset, that being easily converted to cash with minimal loss in value in a short period of time.LTV, while a sibling, isn't really the best indicator of a portfolio assessments as we are leaving out appreciation, depreciation, value of improvements, cash invested, carrying costs, management and taxes.