You are absolutely right. Units built years ago did not require any specific parking when they were made. Current zoning laws are correcting that by requiring appropriate spaces per unit. But with older condo projects grandfathered in, it is really hard to park in some areas.
There is another reason as well. Glendale is an older city and back in the day most families had one car. Now both mom, pop, as well as teenagers all have their own vehicle. I know one family consisting of the mom, pop and 3 boys. They have 6 cars.
Other areas are more forgiving for parking. Burbank, Montrose, La Crescenta and others have fewer older condo project and so, therefore, have more parking. If you need help looking in some of those areas, I would be happy to let you know what streets to drive by to take a look for yourself.