You are saying that the poster is breaking the law in this specific instance. 

Boston  requires the following:DO: Remove snow, slush, and ice from sidewalks and curb ramps abutting your property within 3 hours of snowfall ending (or 3 hours from sunrise if snow falls overnight) as required by law.

When you put up the sign that says "no parking" and "tow zone" you set an expectation that you, the property owner, would enforce that.You also need to be aware of towing laws for your jurisdiction.

Your roommate has rights of tenancy in accordance with Oregon law.3.

Others have mentioned to take a look at the condo association by laws.

I do not know if this is because they have little real estate experience or if they are all foreigners and do not understand US property law and trust law basics.

Thanks to the new fire suppression law in Minnesota, we plan to finish as close to 4500 sq/ft as possible but not more

Uhhh you do realize the disastrous law is a signature piece of legislation of someone with veto power who thinks himself infallible.  

If you are in a municipality with rent control laws you will have to research them in detail and comply with their rent-increase requirements.In New Jersey you must provide the tenant with a Notice to Quit and a notice of the rent increase.

If the material is not current, like this year by a CPA or a law firm (not a guru lawyer) a government agency or a university/school, ignore it!