140k is not much in SF.
140k after federal and state taxes amounts to about 90k take home or about 7500 per month.
Avg monthly cost of a one bedroom apartment in SF is 3500.
Avg monthly combined utility bill in SF is 170
Avg internet/phone bill is 70
Avg public trans monthly pass is 70
Avg monthly groceries and restaurants are 450
Avg fitness club is 75
Subtotal about 4335
Add a car, insurance, registration, parking
Add an additional bedroom
Add a preschool child
Total: less than zero
In sum, a single IT worker can possibly save a couple of thousand per month.
An IT worker who is a single parent of a preschooler has no chance at all to make it there. Add a spouse who works part-time and maybe they will just get by but they will struggle.
Add facts such as crime and homelessness are rampant in SF, and it becomes clear that the 140k per year lifestyle of an IT worker is a miserable proposition.
http://www.sfgate.com/bayarea/article/San-Francisco-rent-cost-drop-rental-6690357.php
https://www.numbeo.com/cost-of-living/in/San-Francisco
One major Freeper short coming is not adjusting for inflation.....Many seem to think a minimum wage of $10.00/hr is a lot of money LOL!