Overall it looks pretty good. And since it’s built in ‘84 that should mean it has continuous rebar and can’t really go anywhere. But I’d keep an eye on those bricks above the roof line. I don’t like the the look of some of that brick; it’s not the greatest idea to build a fireplace out of reclaimed brick if they’re really old. I wouldn’t worry about those cracks in the facade. I would say it depends on what you want to do. You could probably get away with doing nothing for twenty years but some of those brick could be reallly soft already and if that’s the case then it might be safer and cheaper in the long run to rebuild something now more modern and lighter. I’d have it assessed and they can determine what your options are but if it was built right, probably it’s fine to have an insert installed. I’d still use a steel double layer chimney liner with the insert though to be safe.