You would be hard-pressed to afford an SFH near Mountain View on one $300k/year income, unless you've worked for at least 5 years (probably more) to save up a down payment. Even then, that's the low end - any house you can buy with that income will probably be small (1500 sq ft max), built in 1960s at the latest, and in need of $100k-$200k of renovations to bring it up to modern standards. You might be able to buy a townhouse that's decently modern, but that will charge you $500/month in HOA for very minimal amenities (not even a pool in many cases).

With these options, unless you're starting a family and need the space, these apartments seem like a good deal for younger people working for Google. It will be priced to be within a Google engineer's budget and will have much better amenities than any SFH for sale that costs below $3m.