Also, added smart-deadbolt locks to each bedroom for extra security in house-hack situation.What was the outcome?

Syndicators do this because most passive investors are not sophisticated enough to realize the "security" of the preferred return means they usually are giving up the potential for massive returns if the deal does well.This next comment would apply for all syndication.  

The seller was motivated to close fast, allowing us to secure the deal and set the stage for a profitable resale.

New tenant security scheme that only benefits Suncoast and the tenant - leaves owner paying up at move out. 

Cameras, security system, motion lights, cage lock on hvac, etc.They were stolen cause it was vacant and had a for sale sign.   

Very few allow any subordinate financing below their note but I do have ONE that allows 90% CLTV (they loan 75% and allow you to secure a 15% seller carryback as long as you come in with 10%). 

Pro tip--make sure your exhaust fan in the bathroom is vented to the atmosphere--meaning out to the outside.....go out the roof or out the side of the unit or secured to an opening in a soffit vent grille off the house. 

Toward the end before closing, they gave bunch of excuses like security breach in their company, don't like the file and the property.

@Chris Seveney @Nathan Gesner The owners offered to cancel their lease and return their security deposit in full.

However, I find myself uncertain about how to structure such deals and whether I could successfully secure them.I was wondering if you could offer any recommendations for educational resources that might help me better understand and navigate the intricacies of creative finance and seller finance deals.