The parsonage is the house, usually owned by the church, where the minister/priest/pastor/"parson" is allowed to live, usually rent-free. I have heard "casa pastoral" used in both Roman Catholic and Protestant settings.

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Note added at 46 mins (2007-03-05 05:06:32 GMT)
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Since the is the U.S. ("IRS") where Protestants are the majority, I think your translation probably calls for an ecumenical solution. But, of course, I don't know what sort of text it is. Your choice among the three correct answers offered so far may be influenced by the denomination involved. I have, indeed, heard "rectoría" (with an accent!) used in other churches than Catholic--Lutheran, for instance--but I doubt that it's the sort of "neutral" choice that the IRS or other government agency would be likely to make--I repeat, in the U.S. In Latin America it would be far otherwise!

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Note added at 48 mins (2007-03-05 05:08:06 GMT)
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The above should read: "Since this is the U.S...".