I loathe these kind of attempts by the press to interview people...and I say this as someone who works in a media/communications related field.
That said, the reporter is not restricting TH from "freely moving about", he merely followed her and asked her a question.
Also the right of innocence until guilt is proven is a right inferred in court cases, it is NOT something that binds citizens OR the press from questioning/reporting on/having opinions about an ongoing criminal investigation and the people involved with it. OF course she has the same rights as everyone else, but I didn't see the reporter violating any rights. The press have their own constitutional amendment, and they have a right to report on news...including reporting on ongoing criminal investigations. Were they not to at least attempt to get an interview/feedback from someone who is, by all accounts, a subject of a criminal investigation, they wouldn't be doing their job, IMO. TH has a right not to speak to them, but the press has a right to report on the story...and asking her questions isn't preventing her from her 'freedom', IMO.
Lastly, the building may be private property, but it looked to me to be a standard office building, one that her lawyer probably rents in (not owns). I've worked in a ton of such buildings, and none were marked as private property...i.e., they didn't have 'no trespassing' signs, etc. They were open to the public because the tenants inside very often were open to the public. The landlord could try to press trespassing charges, but they'd have a hard time if 1) there weren't any 'no trespassing' signs, and 2) the person who told him to leave the property weren't owner or manager of said property. I say this as someone who worked in a downtown office building owned by a notorious businessman/trial lawyer who currently owns a major league sports team...the lobby and plaza outside of our building was occasionally filled with camera crews who weren't always, um...kind in their reporting. From what I was told, it wasn't worth the owner's time to pursue them for trespassing...because our lobby was 'open' because of multiple other 'public' tenants (including state gov't offices) and because it would be hard in those circumstances to pursue the press. Edited to add: our security guards usually asked the reporters to leave the lobby, and they usually complied. But sometimes they timed their entry just right so that Mr. ajdalfja;lk was leaving and they could similarly pursue him with questions.
The reporter was a jerk, IMO. But he was well within his rights. That's one thing about our country, people have the right to act like assholes some of the time.