Go do a search for "property" and "properties" on Google. You will see that the results that are returned are different. This is because Google treats singulars and plurals as different keywords. Someone searching for "property" has a different search intent than someone searching for "properties".
Think about the search intent of someone searching for property vs properties. Properties to me suggests someone looking for a list of a bunch of different properties on one page, whereas "property" seems more specific.
If you think that your page is relevant to both queries, then include both keywords on the page and possibly in the title to increase your relevance for those terms. Get backlinks to that page using both keywords as anchor text.
If you don't think your page can adequately serve people searching for both keywords, then it makes sense to create two separate pages targeted at each keyword. Yes, this can be done in a spammy way, but it can also be done in a way that adds value to the user and provides a better fit for what your user is searching for.