I am not seeing how a 36 year old not-racy Trek with a 10 year old fixie conversion rises above the noise of all the other old bikes. Just lock it up, it will probably be fine, and if it isn’t, it’s not hard to get another old bike.
If this bike has some sentimental value to you, don’t burden her with taking care of it. She’ll have enough on her mind.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."