I don't thing they are efficient, I had it in my office for years, the minute you stop it, cold or hot, air is gone. 

@Justin Tylus I know from my clients in Raleigh that the permit office is running slower than normal.

I would recommend going over your different options with a financial advisor or an experienced investor before you start buying assets (and some loan officers may be helpful, but they're trying to sell you loans, so there's a conflict of interest there to be aware of.)

I would love some advice from the pros out there - I'm really stumped on the best way to accomplish my goal...I have two businesses and want to purchase an office building under a new LLC and lease space to my businesses.However, what I really want to do is also have other tenants so that I will have multiple revenue streams.

I have a tab for each property.I keep a word doc for vendors with a table of contents with links to headings such a plumber, hvac etc.I get recommendations from my large local RE club whether I askednor someone else asked I keep this contact info for future reference.I have no need to pay for a service when I can easily and quickly manage with systems I have built using Microsoft office that I already have.Tenants pay rent via deposit, ACH Zelle or PayPal.

We will not allow them full access to any of our computers, smart phones, office and so on.

The open dining room and living room also include an upgraded office nook w/ matching quartz desktop.

I spoke with an escrow officer this weekend, and I think that the best way to go about this would be to lay out the specifics in the loan doc, and not worry about doing a deed of trust between them and myself.

I converted a Restaurant/bar/banquet center into a multi-tenant office building.  

Most officers avoid enforcing anything like that because it is murky.