Вот идея на будущее, так как идентификаторы / классы могут меняться за период:
from re import sub
from bs4 import BeautifulSoup as bs
teststr = """<span class="office-address" itemprop="address" itemscope="" itemtype="http://schema.org/PostalAddress">
<span itemprop="streetAddress">
<span class="address-line1">5835 Post Rd.</span>
<span class="address-line2">Suite 217</span>
</span>
<span class="city-state-zip">
<span itemprop="addressLocality">East Greenwich</span>, <span itemprop="addressRegion">RI</span> <span itemprop="postalCode">02818</span>
</span>
</span>"""
r = bs(teststr,"lxml").getText().strip()
r = sub( r"\n", ", ", r)
r = sub( r"[, ]{2,}", ", ", r)
print ( r )
Результат:
5835 Post Rd., Suite 217, East Greenwich, RI 02818