I think Mary has a great response! I'd like to suggest you send some of your photos to either the Lakeside Historical Society or the Chamber of Commerce. The Chamber's email is Chamber@LakesideCA, and both the Chamber and the Historical Society have their own Facebook pages - you might enjoy some of the old photos on the latter.
The Western Days Parade and Rodeo are next weekend, if you happen to have any old photos of either of these events, those would be great to see as well! My parents also own a home in Lakeside built in the late 1800s.
The tax records indicate that the home was built in 1903, but it was apparently extensively remodeled in or around 2003, so its effective year built is 2003. It was sold in June 2011 for $252,000, according to Realist tax records. Sometimes even the Realist tax info is incorrect - there may have been insufficient or incorrect record keeping when the deed was originally recorded or sometimes there are typographical errors in the databases.
It is on a large lot in what appears to be an area with mixed zoning. There seems to be a lot of value in the land in the area.
Also, some websites that are called "aggregators" or "syndicators" don't or can't publish all the data on a home on the market. What is relevant to a buyer is that the home is not in 1903 condition, but has been upgraded.
It must be interesting to see information about a home that has been in your family for so long and to see how it and the neighborhood may have changed.
If I can help you with any other questions, please let me know.