Ok, I shouldn't be giving any advice here because I don't own a home (and never have). But I do LOVE historic homes and have lived in many.
Your house is at the heart of your family. If doing these renovations makes it safer and loads more comfortable then go for it. Not only that but you are investing in something that matters..not just to you but to the community. Every time someone fixes up an historical home it preserves a piece of the history of the community as a whole. Its one less house that will be eventually sold for the land and inhabited by ugly cheap condos. Its one more house that I can walk by and dream about owning in the future

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Not only that but because of where you live there is very little chance that investing in your home will ever be a bad investment. When real estate all over the country is tanking in SF and the East Bay prices have already rebounded...up 14% in the last year in SF with EB not far behind. Which is great for you (but sucks for me LOL!).
I think doing these upgrades/repairs will make a huge difference in your quality of life. How is having money socked away that you cannot touch more important than that?