You can't cut corners, and you can't do it on the cheap and still be protected.If you rely on an entity or entities to protect you then you should not physically provide any service directly.

Are there any physical offices in Houston? 

Historically, on large multifamily deals in the city (B in C+ area) you'll see avg physical occupancy of 94% and economic occupancy of 89%.

But the attorney you use can overnight you the closing package, so you don't physically have to go there.

I will be there physically to collect the keys.  

I closed two philly deals this week.. all of my closings all around the country are mail away.. so its just business as usual.. those that need or want to go to physical closings which i personally have not done in years..

Is it physically possible - yes.

You would think that they would have a physical location and that many would be hired and trained as customer service agents to expedite things, but no.

You don't have to physically be at the property (all three of my rentals are either 200 or 2000 miles from my home) but guests require attention.  

I know many people who own businesses and restaurants who end up using an additional layer of LLC: LLC1 is for the operations of the company, LLC2 is for the actual physical assets and LLC3 is for the [IP] and brand.