You could point a canonical to the original source (in fact that is the way Google prefers it). It's a great solution if it's you who's syndicating the content. However, if you would do that, you would loose any opportunity to get ranked on that content.
Googles view: (source: https://support.google.com/webmasters/answer/66359?hl=en).
"Duplicate content on a site is not grounds for action on that site unless it appears that the intent of the duplicate content is to be deceptive and manipulate search engine results. If your site suffers from duplicate content issues, and you don't follow the advice listed above, we do a good job of choosing a version of the content to show in our search results."
The big problem with duplicate content across different domains is that it's up to google to decide which site is going to be displayed. This could be the site which is syndicating the content, but it could also be a site which has the highest authority.
In your case - if possible I would try to enrich the content you syndicate with content from other sources. Examples could be interesting stats on the neighbourhood like avg. age, income, nearby schools, number of house sold & average price...etc or other types of content that might interest potential buyers. This way your content becomes more unique and probably more interesting (and engaging) for your visitors (and for Google)
Hope this helps,
Dirk