Your most reliable source would be the builder of that model home. Since it is new there should be no problem finding the reference number.

Your local climate is much different from mine. And also, I don't grow my plants indoors since I am lucky enough to have good weather all year long for my succulents here in SW Florida. But I'll give you my experience with this plant. It rots easily! Now I do have humid and in the summer, wet weather. This is not what you have. I am on my 3rd Campfire plant. Here is a picture of my first rotting plant. Notice how rich and dark the soil is! It retained too much water.Out of all of those stems and rosettes, I got only 2 tiny plants to root and grow. Almost all of what you see had rot and the stems were still pretty rigid, not limp at all. So this can be deceiving. Here's a closeup - every stem and rosette that I cut was slimy and falling apart. This happened rather quickly, by the way, in spite of being in full sun. I strongly encourage you to at least use 50% perlite with your soil. That was not enough for my wet conditions, but it works well for many people. I now have my newest plant in the full gritty mix and things are going well - - - but I am keeping a close eye on things this year. Good luck! This is one of my favorite plants. So colorful!

Contact a Natuzzi dealer and they can probably help. In my experience even the cheapest Natuzzi is leather anywhere your body touches so maybe if it was a cheap sofa the back if all one piece will be vinyl for sure .

Hi Melissa Chow, It may be a fungal or bacterial infection. In some cactus plants, I have seen these black spots spread through wounds.