One common thing I hear in threads (including this one) is a lack of distinction between the roles needed to execute projects like this. 

We had a receptionist in common and shared a copy machine, kitchen, bathrooms, and conference room.

In this case, a competent prosecuting attorney could easily make an argument that your entity is not a valid business, and could likely "pierce the veil" of your entity, as it's called.Lastly, if you put multiple assets into one entity, then a lawsuit arising from any one property puts them all at risk.

The most common portfolio style loan in Texas is a 20 year adjustable rate loan.

4-5% seems to be common.

@Colton Looper probably the most common way to deal with that issue is either 1) put in the purchase agreement that one of the units must be delivered vacant, then it becomes the seller's issue to get one of the current renters out (a lot of sellers will push back on this though), or 2) do something along the line of cash-for-keys where you basically buy them out of their current lease.

I have been researching ways agents generate leads and I see that it looks like zillow and Facebook/google ads are pretty common ways.

The most common is a 5yr fixed rate period. 

It is common to ask for tax returns for commercial tenants.

I hope this isn't a common thing (once per month or less).