Also, what extra contingencies may be good ideas to include.Thanks in advance! 

Who in his right mind is going to hand equity over to the bank when sales routinely close for all cash,  no contingencies and close in 10-15 days?

Most contracts do have it as a contingency. 

What is important know ex: contingencies with the city and/or other unknown circumstances with dealing with such a property?

It's down around 35% based on conservative valuations and I want to get up to around 75%, which means doubling assets under control (mostly going more into passive NNN and MFH options versus active management of SFR).Since I'm not a strong buyer with leverage in this market (I'm seeing all-cash $100k over-ask no contingencies bidding wars right and left), I'm looking instead to buy partners out of existing ownership of these LLCs.  

I've put in an offer on a 4plex that's been accepted minus the following contingencies I had to review: maintenance records, leases and rent roll.

-if he has Not returned a signed copy to you, you can Withdraw your offer at any time, up until written acceptance-is he likely to sue you....no-did you not have any inspection or other contingencies in your contract?

I waved all contingencies besides the mortgage contingency.

Being on the road so much you need to almost approach it as an out of state investment and plan for contingencies while you are away.

Due diligence (and contingencies for rehab overages) are a must.