Thanks Sorry, not in a forum post, look at the aspects I mentioned and each requiring analysis, there is no rule of thumb, golden rule, begin by understanding that every property is unique, no other property is identical on the face of the earth.

People like to steal things these days, like identities.

Is floor plan identical upper and lower units?

Ftg. of both units is identical)?

Since the tax on the Roth contribution is calculated AFTER the contribution is made, there is no way I have less than $100K contributed to my Roth over the same period of time that you are making identical contributions to your Tradtiional IRA.

The realtor (mine, not the selling realtor) stated that two identical models sold in last 90 days for 245k and 259k respectively.

With a condo it's fairly easy since there will probably be identical units in the same building that have recently sold.

If in doubt, say no because that is probably the right answer anyways.If you really can't deal with tenants and feel you need to shield your identity, you should put your property inside a legal entity and hire a property manager.

What other than your name did they have to confirm identity? 

This property is a fourplex so we eventually (after 4 months of operations) decided to not manage inventory on a "Per-unit basis" and rather on a "Per property basis" With 4 identical units, it became pretty tedious trying to remember which one was out of what.