The current requirement is 15% low/very low income housing, 85% market rate. "Low-income" in this context means affordable to a single person making about $40,000 a year, "very low" more like $30,000 a year, or slightly more in each case for a larger household. So an apartment that charges about $1000 a month rent counts as "low-income" housing in a development like this. Not sure how the changes in policy will affect this--it was approved under the previous rules.
Here's a link to the draft EIR:
http://www.cityofsacramento.org/dsd/...esDraftEIR.pdf
According to the Land Use table, the "high-density" portion will be about one-third of the units, 15-27 units per acre--in other words, a population density roughly like the less dense portions of Midtown. About half the site is called "medium density residential," about 8-14 units per acre, more like East Sacramento or Land Park (or the downtown central business district...). The rest will be 4-7 units per acre, more like River Park or South Land Park. The "sweet spot" for transit-oriented development is considered closer to 50-60 dua.