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The problems is that it is quite possible to define a property using @property in a class and then later to realize that it really ought to be a class method, not an instance method. But then, if you change it to a class method, using @classmethod annotation, the @property annotation will fail to work. If you are a pedantic person, and name your properties differently than you name your methods, you have to:
1) Change all uses of this former property back to method invocations, with a "()"
2) Change the name, so it now reflects that it is an actual function, not a property any longer.
I think an @classproperty and an @staticproperty decorator would take this problem away.
An alternative would be to make it possible to chain @property and @classmethod. I know that this is sort of doable for ABC.abstractproperty which is now deprecated in favor of @property combined with @ABC.abstractmethod. This would be ideal, but I can not pretend to know if it would be possible. Also, I suspect that the order would matter as it does for ABC as described in http://bugs.python.org/issue16267.

@"the mulhern" sorry that this slipped under our radar.
@Nick I've put you on the nosy list as you actioned #16267 which is referenced in msg211416.

To get the behaviour you're requesting, you need to use a custom metaclass and define the property there. The reason is that the descriptor machinery is bypassed entirely when setting or deleting an attribute on the class itself:
>>> class Example:
... @property
... def p(self):
... return 1
... 
>>> Example.p
<property object at 0x7f0901d7d548>
>>> Example().p
1
>>> Example().p = 2
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
>>> Example.p = 2
>>> Example.p
2
>>> Example().p
2
>>> Example().p = 3
Hence, the only way to get a "class property" is to use the normal @property descriptor in a custom metaclass (i.e. the class-of-the-class)