parsing multidimensional array from php to jquery - php

Question

I am using php and jquery to read data out of a database, put it into a 2-dimensional array, return it with jquery, and display it on a webpage. I get tripped up when I try to display it.
Here's my jquery code:
$('.sf1930').click(function(){
$year = "1930";
$.post('get_year.php', {year:$year},
function(data){
console.log(data);
$('#occupant_rect').show();
var obj = jQuery.parseJSON(data);
//$('#occupantList').append( data[0][1] );
console.log(obj[0].address);
$('#occupantList').append( obj[0].address );
})
})
The first console.log displays my data beautifully:
"[{\"address\":\"1202 Arch St.\",\"occupant\":\"Morris Wolfe tailor\"},{\"address\":\"1400 Arch St.\",\"occupant\":\"The Great A&P Tea Co. Grocery\"},{\"address\":\"1500 Arch St.\",\"occupant\":\"Hoge's Drug Store\"}]"
but the second console log shows that obj[0].address is undefined.
Here's my php code:
$year = $_POST['year'];
//echo json_encode($year);
if ($year == '1930') {
$q1930 = "SELECT address, occupant1930 FROM mytable WHERE occupant1930 <> ''";
$result = $mysqli_getstores->query($q1930);
while($row = $result->fetch_array(MYSQLI_ASSOC)) {
//echo json_encode($row['address'] . ',' . $row['occupant1930']);
$response = array(address=>$row['address'],occupant=>$row['occupant1930']);//end array
array_push($responses, $response);//push this array of one record into a larger
//array to hold all records
} //end while
echo json_encode(json_encode($responses)); //return the array of arrays
}//end year == 1930
?>
Note that I've double json_encoded the results.
I've looked at a number of stackoverflow questions on this topic, but the answers don't appear to be working for me.
Does anyone see what I'm doing wrong, please?