You would need to look at your contract and determine (if you are pending) if flooding is an excuse to terminate their P & S agreement. 

I’d like to get them under contract this week to wholesale, but struggling to figure out the offer. 

Just had my termite inspection yesterday here in South Jersey on a fix n flip I have under contract and it shows extensive damage in crawl space to almost every floor joist, sill, etc.

I hope to identify a property and be under contract within 7 days.

I'm currently under contract on a smaller, 5-unit commercial office/retail property. 4 of the 5 leases expire in April/May of this year, and one of the contingencies of the sale closing is that 3 of those 4 soon-expiring leases renew for at least one year (I have full negotiating power over those leases).All of those tenants have showed no intention to vacate, and are happy with their current situations.I've seen/read in many places that it is best practice to stagger leases as much as possible in order to avoid the possibility of multiple tenants moving out around the same time, leaving numerous units to be turned over.Would it best for me to try and get 2 of the 4 tenants to renew a two-year lease (which they've done in past) and the other two tenants agree to a one-year or three-year lease (both have been year-to-year in past ).

Then a few months later when I have the property in contract to sell my title company turns up an open mortgage. 

I am now under contract to purchase a triplex using my VA loan with a tehab component, where will will live in a great home in one of the most desirable neighborhoods around, while renting out the two units in back. 

I think there are few different ways to do this (e.g: lease option, subject to, land contract) Check out this article to get started then search the individual tactics in the BP search bar to get more info. https://www.biggerpockets.com/renewsblog/2011/07/20/seller-financing-3-kinds/

In the future I will have it spelled out in the contract the lessee agrees to take lien position behind any and all lenders. 

I would recommend doing a contract purchase for the exact loan amount for a year before going with a loan from a bank - if you don’t then the bank will only loan you money for exact purchase price of the house (assuming it’s lower than the appraisal value).