Ouch! As a fellow HCOL resident, I sympathize. I made a mistake like that once, 50% of my gross went to housing... You'll make your own decision, but I'll share my rollercoaster lessons learned during the last HCOL "hot" real estate market:
In 2004, I bought a 1100 sqft HCOL condo for $350k, paid nothing down (although I had about 10% saved) because financing was easy to come by in those days and I had great credit. When I look back at the stats, I shudder: $65k annual income, monthly housing payments of: $1700 mortgage, $400 taxes to escrow account, $300 HOA fees, and $360 interest-only HELOC that slowly increased to over $500 in the subsequent 2 years (thanks to a variable interest rate typical of HELOC). Because I was in my early 20s, it was easy to live cheap; work offered a lot of perks & I had a roommate who paid $700 rent. From the start, I was dilligent enough to work on paying off the HELOC, but it took a PAINFUL 8 years to accomplish, most of the traction happening in years 6-8.
Housing prices continued to rise - I gained $150k in equity in 18 months. Fast forward thru the housing decline 2006-2010, and the value declined 20% from my purchase price (oh by the way my income decreased during the recession too). While I never went "underwater", there were times that I would have walked away with close to $0 after transaction costs to sell... and I kept roommates for 7 years to offset HCOL costs. Of course, my income increased substantially and the housing market began to recover about 5 years ago.
^
this story is exactly why the last housing crisis occurred. I never missed a payment, but most people in my place would have.