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Several replies to my question have pointed out my incorrect usage of tax terms. Although I am not a tax expert, I am a scientist and so I should know better than to use imprecise language. Let me ask again with care:

1. Can I add the costs of capital improvements to my cost basis if the house was not our primary residence?

2. Is there a limit to the amount of capital improvement costs that I can add to the basis for either a primary or non-primary residence?