It appears that high water usage was present between the dates of 9/7-9/19.  

But if the council doesn't change, then the worst scenario I see is that they decide to cap the number or put a moratorium on new licenses but even then, the council appears to favor grandfathering in those who operated in good faith under the existing law.

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Jim's post contains a perfect example of the addendum that would appear in your lease.

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It appears they have continued to pay rent on the property solely to house their disgusting cat breeding program. 

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Here is the problem I have... now the Airbnb calculator on the site does not appear to work, so I am using the rental income calculator because, to my mind, the principals are very similar.