Here are some progress photos. The room is trimmed out now and primed with BM Silver Cloud. My initial intent was to use that for the ceiling and then Mt Rainier Grey for the walls. Now, with the prime, it looks too cold. So, I'm going one further step down to BM Winter Lake and changing the ceiling color to BM Harbor Fog. With no natural light, it's tricky with these colors. I'll post more photos when we are complete. Any comments/suggestions are welcome!

I am going to show a couple patterns.. but recognize we would need to add a couple pillows too for the sectional and then add art that helps pull it together... going on the brighter side here with some blue. also, recognize you can have multiple blues in the room https://www.potterybarn.com/m/products/balboa-upholstered-swivel-armchair/?pkey=cchairs-ottomans&isx=0.0 https://www.ballarddesigns.com/larkin-upholstered-swivel-glider/furniture/living-room/chairs/224074?uniqueId=224074 https://www.ballarddesigns.com/larkin-upholstered-swivel-glider/furniture/living-room/chairs/224074?uniqueId=224074

When we bought the house, as part of the negotiations, they had a Radon mitigation company come in and install a radon mitigation system. In the corner of the basement where the radon pipe goes down through the slab, they filled that gap about 2-3 feet out from the corner, but that's it. They filled it with some kind of grey foam, picture attached. It doesn't seem like there is a waffleboard sticking out or anything for drainage.

If you had an architect involved in the house's design, that would be the person to ask. They would know what living spaces are proposed for the basement, how those spaces are planned to be used, type of heating/cooling system, structural member sizes and locations, and other information needed to accurately answer your concerns.