The site says the spaces are valued by the House at $290 per month - about the cost of leasing a space in a private DC-area garage - and $100 of that is deemed taxable.
If Rangel's car had been in that space since its license plates were surrendered four years ago, the imputed income would be nearly $5,000.
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One way to look at it is that if we only look at the 4-year period since the plates were surrendered and consider the House's valuation of the provided parking spot as being $290. / month, my stoat-math makes that work out to $13,920. of income that he has deprived the District of Columbia due to this illegal storage.