I'm not hearing a lot of discussion about the elephant in the room, which is the baby on the way. Expect to have a LOT less recreational time for the next 4 years or so, which means the rationale for living in an expensive place near mountain recreation is seriously reduced. Your recreation time for the next several years will be based on use of your friends/families for babysitting. Believe me when I tell you this: your proximity to such willing caretakers will determine how much you actually get out and do.
Second, if you both plan to continue working, now is the time to start shopping / reserving a spot for daycare. You may find that the cost of daycare is outrageous in your HCOL area, and that should be a factor in your decision. In my LCOL area, we paid about $750/mo for the fanciest Montessori preschool in town. You'll be lucky to pay that per week, because the cost of housing flows down to everything else. The daycare workers must pay their own rent, and charge accordingly.
If the numbers don't work, nothing else does either. DW and I increased our net worth by about $100k per year while having a baby/toddler, maxing out our 401k's and Roths while simultaneously paying for childcare and a mortgage, but that's the magic of LCOL areas. In your situation, my concern would be that you're (a) paying a huge premium, to (b) be close to amenities you cannot get much enjoyment out of anyway, causing (c) your FIRE date to evaporate into the very distant future, causing (d) you to not be retired 6-16 years from now when it would be ideal to take the little one on adventures. There is an alternative to this trajectory in which you can be homeowners AND retired 10 years from now, plus or minus.
One last note: New parents tend to believe they "need more space" and upsize their housing prior to the arrival of their first baby. For at least the first year, more space is irrelevant. Separate bedrooms don't mean you aren't waking up in the middle of the night when your little one does, and it doesn't provide more privacy. It just means you have more rooms to clean. If you can fit a crib into your bedroom, and use existing furniture or bathroom counters as the base for your "changing table" then you'll actually have a shorter "supply line", lower costs, and less hassle. If you need a dedicated workspace, there may be no alternative than to go with a 2BR unless you get really creative.