Sharraxaadda

I live on an apt building on Gerrard St with my unit facing south onto Gerrard St. For 2 weeks or more now there has been a beeping noise coming from somewhere outside. It will persist for about an hour then stop of a bit, usually happening 2-3 times when I'm home. Recently it has been doing this late at night which is maddening. Not sure if it's a fire alarm or from the Ryerson building across the street but it's driving myself and other tenants insane.