If you were a Massachusetts (MA) resident at the time you sold the property any gain on the sale is taxable by MA. Because the property was located in Missouri (MO) it is also taxable by MO. MA will give you a credit for tax paid to other states for the MO tax you pay. So you don't allocate part of the capital gain, you allocate 100% of the capital gain to MA, if you were a resident at the time it was sold.
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