(I am assuming, from your post, that the tenant made no other arrangements - in writing - as to where to *send/deliver* the itemized list and any amount due.)Note that the law is mum on forwarding or not forwarding the first class letter that you shall mail.

If you want formalized training, your best bet is to take a course and then network like crazy to get in the orbit of other successful syndicators so that you can see how they operate.Here are some resources:Value Hound Academy with Craig HaskellSyndication and Crowdfunding WorkshopGene TrowbridgeJillian Sidoti

Particularly around the Springfield Town Center, where 2 million square feet of commercial space and thousands of residential units are in the works by property owner Pennsylvania Real Estate Investment Trust (PREIT), to be delivered by 2026.Below I will go into the reasons why Springfield Virginia real estate market has strong potential for future growth in the coming yearsSpringfield Town Center is Approved to add 2 million Square Feet of Commercial Space and Thousands of Residential Units, Coming in 2026Although many malls suffered greatly during COVID-19, certain malls have begun to make a comeback, such as the Springfield Town Center, which not only is at pre-pandemic levels of visitors and retail vacancy of 4%, but the average time of visit has increased for the mall.

It is the delay in getting financing in a timely manner so that I may begin my rehab on my fix and flip that is making me feel not very confident in their ability to deliver.

If called due (I’ve done several thousand probate deals and it’s happened exactly once because of my early lack of training 40 years ago) you will run the risk of needing to pay of the old loan by refi or selling.

I would say at minimum you need your lease, your 3day notice letter, mail receipts, pictures, etc, also perhaps a copy of your bank statement where you show they paid rent, then didn't.Get busy with this....if they can't pay $900 or whatever this month, no way they can probably pay $1800 next month or $2700 in month 3.One thing that might save you time.....mail, certify mail, and hand deliver your 3 day notice. 

This forum is full of real estate experts, and the ones who are hard selling courses, trainings, mentorships, masterminds, tribes, or snake oil usually don't last long here. 

. - Wait and hope that they deliver returns. 

If a 20 x 8.5 unit delivered is $3000 and it rents for $90 per month that is 3%, at a time when 1% is hard to find.

Check out Deal Machine.Do not pay for training yet.