Or yelling "fire"... Another restriction, but a reasonable one that preserves the safety of others. Confidentiality agreements preserve what is construed as a kind of property: trade secrets and the like.
Rental Agreements... signs in cubicles... Property rights as well. It's the landlords who pays the taxes, and the company that owns the cubicle. And I'm perfectly happy for them to keep it.
limitations on things such as sign-age, flags, displays, etc.
Codes that limit size and placement of sign-age are actually protections the property rights of adjacent business, as well as public safety.
In my colossal ignorance of the constitution I don't see how a patriotic sign outside a private residence can be construed in the same terms as the examples you give.
Your statements were that free speech rights were inalienable and they cannot be contracted away. Now you backpeddle frantically. Well, looky, I gess they can be.
A CID is a private organization you contract with willingly. A sign of any kind outside a private residence where the owner has agreed in advance not to put one up is a contract violation and can be dealt with as such (in a CID it means a fine or physically removed).
So it appeasr you don't understand the Constitution AND you don't understand basic contract law.