Structural

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Hey guys, we just started hearing a loud buzzing noise coming from our bathroom ceiling. We have a few recessed lights and a ventilation fan, and we hear the buzz even after I cut the power from the circuit breaker. Any thoughts? I’m concerned about the safety aspect. Thanks!

I am looking for a structural engineer, preferably based in Brooklyn, who specializes in small jobs dealing with historic townhomes – particularly opening up masonry walls. Any recommendations?

I’m attaching a photo of a mysterious substance on a wood door frame I noticed at an open house this weekend. Substance is while, dried, and caked on – with brown staining. Anyone have thoughts about what it is? The apt is 4th floor, so it’s not basement moisture. It’s on a wood door frame…

Looking for structural engineer to draw plans for small job. Is there such a thing? Do structural engineers do small jobs? Any recs appreciated.