What people mean by active property
Active property is a phrase rather than a fixed term. In everyday property talk, people may use it when they are describing a property that is currently occupied, one that is part of an ongoing process, or one that is being discussed in an active way. The same words can point to different ideas, so the sense usually comes from the conversation around them.
The words are not tied to one meaning. The activity being described, whether use, occupancy or management, changes what the phrase is doing in the sentence.