Hi Nancy,
I would urge you to invest in a normal lens, if that's what you're comfortable with from experience. That's not to say you should pass up the 210 if it's a bargain. My guess, in your case, is that a 210 may feel somewhat awkward and limiting at first.
For landscape and architectural 90-135-150mm lengths are all wonderful to work with. My first lens was a 150, second lens was. 90 and then a 210. I tend to use the 90 and 150 the most. Again, these are personal prefs and you will need to learn and judge from experience. The forum members give great advice, but it may not necessarily suit your taste.
Perhaps the person selling the 210 will let you try it for a short period. If you do buy, heed the advice in some of the earlier posts. Alternatively, you might be able to meetup With someone in your area who would be willing to show you their equipment and lenses. You might always rent a lens or two for a day just to "play" with - no film.
Hope this helps.
Dennis
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