Trouble Parsing XML in Python with xml.doc.minidom

I am trying to get the lot size of a house from Zillow's API, but I am not printing out the correct result.

My goal is to print out the value in the XML field of "lotSizeSqFt". Whenever I print, all I get is empty square brackets. Anybody know what's going on?

from bs4 import BeautifulSoup
import requests
import urllib, urllib2
import csv

from xml.dom import minidom
import xml.dom.minidom

#makes an api call for a given address
def makeCall(address, cityStateZip):
    url = "http://ift.tt/1vbYL2F" + address + "&citystatezip=" + cityStateZip

    #parse the XML document
    xml = urllib2.urlopen(url)
    xmldoc = minidom.parse(xml)

    return xmldoc



def getData(address, cityStateZip):

    #returns parsed XML doc
    xmldoc = makeCall(address, cityStateZip)

    #get necesary data
    lotsize =  xmldoc.getElementsByTagName("lotSizeSqFt")

    return lotsize


address = "10608 Floral Park Lane"
cityStateZip = "North Potomac, MD 20878"

print getData(address, cityStateZip)