They don't want the additional risk of having some other property's trouble endanger their investment/loan.The parent / holding entity would probably be for the anonymity. 

We mainly invest in Hamilton Ontario but recently venturing a few hrs away where cashflow is not an endangered specie :)

As @Ben Leybovich  started this post with, the real lesson may be that us newbies that use an income/expense ratio on these lower Class/lower rent properties endanger themselves from the true expenses.

Thanks Nathan,my attorney just told me that in Chicago right now they are evicting for crimes and for endangering other tenants only.

Not sure where you are located, but depending on where your are, you should determine if it is in a flood plain, if its endangered species habitat, is the land protected with a deed restriction for anything-eg. conservation area, it is classified as a wetland, were hazardous materials released or stored there in the past, was it a gas station or have any underground storage tanks, what easements are there, electrical, water, access, etc., what are the lot setbacks, what is the soil, does the lot receive drainage? 

William Bannister is absolutely correct.Here's some examples of tax sale properties that I've seen:bottom of man-made lakeside of cliff 50 feet tallArmy bombing rangeExpired land lease for river front cottage totalled by flood 30 years agoExpired lease for TV tower pre-cable, that was already removed from propertyLand only with building owned by another party who had pre-paid their lease for 30 years, so if you bought you would start collecting rent in 3 decades.super fund toxic waste siteAbandoned gas station with leaking under ground tanksAbandoned steel millhouse with only 3 walls as the rear wall collasped into back yardhouse on city demolistion listStrip of land 2 feet wide, left over from road widening projectLandlocked residual land from highway projectAbandoned QuarryAbandoned junk yard, various colored ground stains from antifreeze, gasoline, oil, automitive fluids and metal parts.Slag pileChromnium factoryAbandoned building filled with 55 gallon drums of unknown liquidsRavinesWetlandsFlood waysDrainage ditchesSite with endangered speciesGarbage dumpHave a nice day!

I let a lot of stupidity slide, but this endangers people.

IDK, maybe I am just a lone decenter, but it feels like a complete flip of foundation and premise and that what it was that built this is now an endangered species. 

Sorry realtors, didn’t want that to endanger any future commissions you may receive.Everything is negotiable ...especially at the table ...

While the Master Policy sounds interesting, and you can explain the advantage to me, what I want is exactly as you describe the umbrella policy, increased liability coverage so a suit on one property does not endanger the others without having each in separate LLCs with all the ensuing paperwork and cost that entails.