Thanks so much for the info. Sorry it took me a few days to reply, my work schedule has been a little insane... I had thought leaf spot was possible, but the beginning stage of this fungus was like nothing I could find (picture or description) describing Septoria. It looked like a black/brown dust (raised) was covering the undersides of the leaves- like someone held the plant upside-down and spilled soil on it :) If two of you think that's what it is, then it must be. I thought rust both because that was the ONLY fungus that looked even remotely similar and we had rust on a jasmine vine planted about 6 feet away in the flower bed (this tomato is potted so it does not share soil with any plants). The good news is- after an all out assault of (Safer) fungicide (every 4 days) and seaweed- the plant appears to be in recovery. A couple of the young tomatoes appear to be a bit deformed so I'm going to keep a close eye on it. The leaf loss was quite extensive, so I may have a problem with sun scald. (btw, in a couple of the photos you can see the whole plant behind me- it's the potted plant on the white stand). QUESTIONs: If I start using Fish Emulsion with the seaweed now will it encourage some more leaf production to help the sun scald problem? Or will any new leaf growth be effected by the fungus? The plant is potted so I have not grown anything in the soil before, it must have picked up the disease at the nursery. This is my ONLY potted tomato and I'm noticing a few spots on my other tomatoes (planted in a garden), if I catch this fungus early enough will it contaminate the soil? Sorry if it was unclear, all of my plants are outside (I brought my laptop out and used the camera built into it to take the pics- GO MAC!!!) Thanks again for all the posts, diagnosing this little fungus had truly been driving me crazy!

This pic goes with this one. OK, I'll be the first though I'm usually wrong, it looks like scale to me.

'Now, the tub and sink are not vented correctly or (it seems like) at all.' Was the plumbing job inspected? Was it performed by a licensed plumber? Both are required for a commercial building, not just for the current rental units. Have you opened the drum trap to make sure it is clear of debris? What's the slope on the tub drain line from the drum trap to the wall? Your pics show no slope and no vent. Are S-traps legal in your area? Not in mine. P.S. The wiring job looks questionable, too.

11/1/17 update: it’s gotten much worse. The pale splotching has suddenly increased in frequency and spread. I’m noticing splotches on more leaves, and overnight they will turn completely. Some of the branches look gray too: Did I give it too much light too quickly after the transplant? Some of the fine roots came off during cleaning so maybe it has too many leaves in comparison to the roots? Also, the breeze has started to turn cold. It’s still 72 degrees F but the breeze in the house is definitely cool instead of warm now. Is it too cold in front of an open window? I have a spot near my other plants where the light is bright, but it’s essentially where it used to be (on the catwalk) just with more air circulation. The FLF I transplanted in gritty at the same time is looking very strong but hasn’t had new growth after its repot in May. It’s on the same wall just on the other side of the room. The brown spots were from previous root rot. They’re all about 10 feet from a wall of East-facing windows: Here’s the soil now: About 4 months after receiving, when I started noticing the hypo-pigmentation: Right after transplant: Currently: Pale splotching/bleaching used to just be a few leaves at a time but now they’re in handfuls. So far, loss has been all lower leaves but the top is drooping significantly. Too much light too soon? Too cold with an open window even if it’s around 70 degrees F outside? Just normal stress response to changes? It’s been about a week. All thoughts appreciated!