85mm f/1.8 is an excellent lens, especially for $300ish, that would be great for portraits. But if you're interested in a 70-200 I'd either get one or the other. 70-200mm overlaps 85mm so it would be kinda redundant. I'd consider looking for a used 70-200 f/4 IS or 70-200 f/2.8.
If you want a great UWA for architecture the Samyang 14mm f/2.8 is stellar for $399. I hate to admit it (since I own a 14L II), but the Samyang is a good bit sharper and it costs almost $2k less. The distortion is pretty bad but that's easily correctable in post.