In other words, secure funding privately or secure funding commercially? 

Our typical strategy is to purchase and renovate a property with cash (or Lines of Credit), stabilize it with good renters, then eventually refinance on a 30 year conventional for a more secure, long term investment hold.

The IRS in its Passive Activity Loss Audit Technique Guide published a sample Activity Log.  

TR-31 (new mandatory security) requires substantial cap ex to meet regulatory requirements. 

It's a great technique when you can do it.

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

Does anyone have experience in this market, or with this cost-segregation to write off income technique? 

You may be able to get away with 10% down if you have multiple fix and flips/holds completed in the last 36 months and the LTARV allows for it. what if im able to fund 100 percent of rehab myself, would i be able to secure 100 percent of loan for purchase? 

If you are the highest bidder, you usually have to come up with a payment to secure the right to purchase the property.

I also found out on the day we closed the loan that they have no security deposit either.