Otherwise, you're looking for a fairly straight forward investor loan, and bank or national lender can help you.

HiWhich better to borrow money from private lenders or hard money lenders?

To add another perspective to this there is a renovation, 30 year term Investor  loan available that is not a construction loan one lender I know is offering.

Are there lender requirements on when the rehab must be completed by? 

Are there any lenders out there who will lend solely on cash flow?

In the last 9 days, I've contacted an agent, contractor, hard money lender, property manager, insurance agent, and a mortgage broker.

This may not be ideal, but it is one way.The other way would be to work with a lender who has access to Non-QM products, and whose overlays do not restrict the number of financed properties allowed.

This is important to show your lender so you get credit for your payments towards your total DP at the time of closing.This will buy you time to get the rest of the funds, and also lock up the property.If you negotiate a longer Option period than from now to 4/18, you will have a longer time to get your funding in place, and get a larger total DP credit.

You may consider fine tuning your skills or finding the right people to work with (contractor, mentor, agent, lender, etc) before moving forward on a deal I stopped referring contractors years ago for a number of reasons. 

For the local DC people if you can send me any of your best contacts for local private and hard money lenders, GC and Sub contractors, and any flippers who might be producing turn key or decent investments in the area I would appreciate the extra connections!