There is about an 8% annual return and they expect everyone to double to triple investment when they sell in 7 to 10 years.

And by the way, knowing Amsterdam, TRIPLE CHECK the tax numbers with the city, don't rely on the seller or the agent's numbers, Amsterdam taxes are notoriously high and can kill your profitably in a hurry if you're not careful.  

Competition is fierce- but everyone making triple pre-covid rates. 

Know a triple decker in Cambridge purchased for 2 Million, kept empty for two years and sold for close to 4 million to a chinese investor who was mostly concerned with keeping money out of China and safely invested in the US. 

The removal of the Taxable Value cap and the switch to Non-Homestead millage rates can double, even triple, the property taxes.

Here's an article that will give you some understanding of the commonly used terms.https://www.biggerpockets.com/member-blogs/10850/79257-deciphering-syndication-investment-terminologyAs @David Almeida mentioned, 18% is achievable, but I would triple check the underwriting as it sounds a bit too aggressive given what where we're at these days.  

All of the numbers point to yes, I should do this (even if I develop the land and sell it to a competitor I'd triple my initial investment) I just need some reassurance! 

Snow expenditures of plowing was ok but salting was triple.!

Read a book explaining master leases/triple net leases and how to structure those leases with retirement fund investors.

It was easy to buy a home with four or 5000 down and see your money double or triple in value due to the high inflation rate in less than a year.