If they are requiring all cash, is it because the property will not appraise under a standard or FHA or VA loan?

@Art MaydanFirstly, if this is a student rental, I would recommend that you have the parents be guarantors and sign a separate guarantee which references the lease {i posted a sample in the BP file space a few years ago}.If the parents are signatories to the lease, then they have all the rights of a tenant including the right of access.  

This property i purchased with only me on the loan and not my wife, so when i filed my 2017 taxes i owed $1200.

I opted to file my own compliance paperwork for RIA formation in the Commonwealth of Virginia.

You can get around that by filing a motion for immediate possession if it truly is vacant which will speed the process up. 

Basically- take 5% of the rent I have and put it into the llc bank account to show activity and pay taxes on that later when I file? 

If you are new to the concept, a series LLC allows you to form one entity, pay one filing fee but create an unlimited number of sub-entities that are fully separate for liability purposes.

Pro Forma here.https://drive.google.com/file/d/1k1gVsjRPaDbjUtq8-7Np59a3DOeubLbj/view?

I am married with no kids and both my wife and I file jointly and claim "0" for our W4 as she works as a teacher.

They might receive the first offer on day 1, and the 2nd offer comes in on day 60, and they will merely wait as a matter of standard practice for that 2nd offer to then enter into their multiple offer protocol.