You may say that is what your original post is about, but at least the hotel lobby isn't operating in an underhanded, outside-of-the-rules method. 

Alternatively, you can try to get a private money loan or ask the seller to finance a portion to reduce the down payment, but typically equity is the preferred method when you need funds for a down payment.

No biggie, I'll just add it to an itemized list and take it out of their security deposit. 

The current owner says the current tenant must have done that and that I should take it out of the security deposit when the tenant moves out.

There's a couple things to consider when trying the different methods of real estate investing (buy and hold, flipping, note investing, etc.) 

My question, as this is my first time leasing a commercial space, is what is the average security deposit to ask for on commercial leases?

I was away for a military school when I stumbled upon a YouTube video by BiggerPockets where I learned about the BRRRR method!

I'll scrap that method then. 

I'd have about 150k in pre-tax proceeds (same if used for 1031 transfer) from closing or 130k post tax if I sell regular method.

Seller agrees to finance $x of the purchase price at y% per annum payable in equal monthly installments of $z and secured by a first lien deed of trust.