Put me down in the "I hate commutes" category. I used to have about an hour commute: walk-train-walk, where about 45 minutes of that time was on the train. That was before I had kids, and it got old. So we ate the added expense to move closer. Now I'm about 30 minutes door to door, still walk-train-walk, but only about 15 minutes on the train. I leave the house a little after 7:00am and get home a little after 6:00pm. My wife and I would prefer to move back to the suburbs, but now that we have kids, least-commute-time gets top priority.
I'm still not convinced on why you have to move. We looked a dozens of houses before choosing the one we did, and I'm convinced that square footage means very little. It's all about efficiency and optimal layout/floorplan. We looked at "huge" houses that seemed cramped to me, and the one we ended up buying was actually on the low-end in terms of square footage. But the layout is perfect for us, so it actually feels much bigger than the square footage would imply... so much so that our next house (post-FI) will have even less square footage, but with no loss of "spaciousness".
So: remodeling? What about getting some temporarily housing while you (or contractors) come in and re-arrange the floor plan into something more optimal? There's tons of free floorplans on the Internet, look for ones that have the same or similar footprint as your condo and see if it can be made more efficient. If nothing else, partition off an area for a "bike locker" where you stagger the bikes and hang half from the ceiling. You ought to be able to fit six bikes in a pretty small space if half hang from the ceiling.
Ok, how about renting some storage space near your existing condo? A storage locker, garage parking spot, storage unit in your building, etc? Any extra space you can utilize effectively increases the size of your current home. Have you asked the other people living in your building if they have extra space they'd be willing to rent out? Maybe give up a parking spot or rent out their closet?
What about "outsourcing" functions of your current condo? For example, do you have your own washer/dryer? If so, what if you gave that up to recover some "living" space, and instead used a laundromat? Bathroom consolidation?
So if you're convinced you have to move... does a bigger place in the same area have to cost $100k more? What if you got a bigger place that needed some work? With the time you save by not adding to your commute, you could work on the new house until it's at a level you're comfortable with... This is a value-add proposition by the way, as you'd be adding "sweat equity" to the new house. Depending on the ages of your kids, maybe they can help too. Weekends become "family new house remodeling time".
Back to talking to your neighbors... depending on how your building is laid out, maybe one of your adjacent neighbors would be willing to sell part of their condo's floorspace to you. I.e., you basically move the wall that separates the two units such that yours gets bigger and theirs gets smaller. Probably a long shot, but it never hurts to ask!
Have you read Your Money or Your Life (YMYL)? That book talks about computing your "real" hourly wage. Your salary/wage is just one number, and actually somewhat meaningless. YMYL asks you to first subtract from your advertised wage all job-related expenses: taxes, uniforms/special clothing, supplies (not covered by employer), meals, commute-related costs (mass transit pass, gas & auto maintenance), etc. Take that number and divide by total hours your job pulls you away from doing what you want (i.e. what you'd do if you didn't have to work). For most people, this means you include your commute time as "hours worked".
So, all things being equal, if you increase your commute time, you lower your "real" wage. Of course, in absolute terms, you have the same amount of money, but it attempts to put a number to what otherwise might be perceived as a "soft" cost.
Just as an academic exercise, compute the "real" or YMYL wage for where you're at now, and where you'd be if you move and end up with the longer commute. The latter will obviously be lower due to the bigger denominator (i.e. increased commute time) and decreased numerator (added expense of train pass). Now multiply these two wages by the number of hours you actually work per year. This is your yearly "income" based on your YMYL wage. How big is the difference in relation to buying a bigger house that doesn't result in a dramatically increased commute? Unless you're making the mega-bucks, it probably won't be $100k, but maybe it does add up to $100k over the course of five years, or whatever your period-to-FI is. Food for thought.