It’s hard to guess when those heavy cost items start to fail and when they do you need money then.

Can it cover Multiple properties and does it come a lot cheaper than having Landloard Insurance (Covering Fire, hazards, Wind... ) ?

The pitch sounds good: I can rent out some vacant land for camp spots with essentially no improvements, and they cover the rest, and I keep 90% of the revenue.

That may only cover your original loan. 

@Kusum Chanrai One way to speculate on heavy upside is turning to areas which are soon to be better served by public transportation, for example Chinatown which will soon see the extension of the Muni Metro T Third line through the financial district.

I usually just install a CO/smoke combo on all floors while making sure they sleeping area one(s) cover all and that works just fine with the inspectors.

We get covered up with responses, and you get to do a little screening of the interested parties by checking out their pages.

property owner wants 450,000 which is about 75,000 over market value rents in the area are between 1,600 and 2,500if seller will agree to seller finance my first offer is 375,000 at 0% with 10,000 down and 1200 a month paymentsI have no Capital so I will need to get a 12,000 Dollar Loan from the bank $2,000 will go straight to rainy day fund to cover vacancies and repairsmy second offer $385,000 at 0% interest $10,000 down and $1,200 a month paymentsthird offer $395,000 at 0% interest $10,000 down and $1,200 a month paymentsfourth offer $400,000 at 0% interest $10,000 down and $1,300 a month paymentsfinal offer $400,000 at 1% interest $10,000 down and $1,400 a month paymentsI will rent the property for $2,000 a month with an $1200 depositincome $2000 - $1200.

And the seller has the ability to foreclose if the buyer misses payments, again, unlike a subject to.As far as terms on the wrap, you want to be sure that the terms of the warp cover any situation where the buyer pays off the loan early. 

Either you are mistaken about them taking 15 year notes, or they are getting more in rent than you believe, or they are not putting anything aside to cover any incidentals and are "winging it".