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I want my code to be able to take the Zestimate value off this page so I can work with it (in this case, 10,037,774). How would I go about doing this?

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First of all, the website is returning incomplete data as it is recognizing the Python script. To handle that, you'll have to use a fake User-Agent to emulate a browser request.

import requests

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36'}
r = requests.get('https://www.zillow.com/homes/for_sale/19882656_zpid/34.217551,-118.600674,34.122534,-118.723412_rect/12_zm/1_fr/', headers=headers)

This will give all the elements available in the page source. But now, many elements are dynamically generated with JavaScript. So, they are not available in the page source. The value you want is inside the <span class id="yui_3_18_1_2_1523251661826_947"> which is seen in the developer tools upon inspecting the element.

But in the page source, this tag looks like

<span class=""> $10,037,734 <span class="value-suffix">   </span></span>

So, you can't use that id to get the value. You can get the <span> tag which contains the text Zestimate using soup.find('span', {'data-target-id': 'zest-tip-hdp'}). To get the next <span> tag, you can use find_next('span').

Complete code:

import requests
from bs4 import BeautifulSoup

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36'}
r = requests.get('https://www.zillow.com/homes/for_sale/19882656_zpid/34.217551,-118.600674,34.122534,-118.723412_rect/12_zm/1_fr/', headers=headers)
soup = BeautifulSoup(r.text, 'lxml')

zestimate = soup.find('span', {'data-target-id': 'zest-tip-hdp'}).find_next('span').text
print(zestimate)
#  $10,037,734  

There's another way you can get this data. At the top of the page source, there's a tag that looks like

<meta property="zillow_fb:description" content="Zestimate&reg; Home Value: $10,037,734. "/>

You can find the tag using the property attribute and get the value of the content attribute using ['content']. To get the price, do some simple string splitting.

meta = soup.find('meta', property='zillow_fb:description')['content']
print(meta.split(':')[1])
#  $10,037,734. 

If you don't want the dot ., you can strip it.