In many contexts that would work, but you don't indicate your context. I suppose there could be some contracts, etc. where it would not be formal enough.

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Note added at 10 mins (2009-05-27 04:06:52 GMT)
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In deeds, it's often written like this:

... that certain parcel of real property known as ...

... that certain tract of real property known as ...

... that certain real property known as ...

But, which one is appropriate can be determined only from your context.


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Note added at 4 hrs (2009-05-27 08:11:38 GMT)
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After the context was provided by the asker:

You could use either of the versions indicated above - "pieces of real estate" or "real properties", or even without "real" - just "properties". The sentence fragment you provide is a difficult one to keep from sounding awkward in English, but something like this: "We give careful consideration to the differences between [different features of] the properties under comparison".

I know it doesn't say "careful", but it sounds pretty stupid to say that they take into account the differences between things they are comparing (really? - what a novel approach!), so the editorial enhancement might be a good idea.

In reply to your question about "объекты сравнения", "under comparison" is not bad. It means the same thing as "being compared".