Increase tech firm layoffs to the checklist of headwinds going through the Bay Space housing industry. Increasing mortgage loan costs, economic downturn fears and a unstable stock current market have all tamped down dwelling sales and costs in new months from document-environment pandemic highs. Now, coming into the customarily slow winter real estate year, rising uncertainty in the region’s main marketplace is offering would-be customers a different rationale for pause. “We have customers who have been in and out of on the lookout at purchasing,” reported Silicon Valley real estate agent Mary Pope-Useful. “One of them performs at … Facebook, and they explained. ‘I did not get laid off, but…