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population growth from net natural increase and net migration and of projected household size changes; in the analytical pro- cess, the economic considerations promoting population and household growth had been incorporated in the forecast. Since each additional household represents a demand for a dwelling unit, in either new or existing structures, the household forma- tion anticipated during the forecast period, plus required replacements, is held to be equivalent to' ~'ro'ss quantitative demand for housing financed at market rates for owner or ten- ant occupancy. The projected gross demand is subject to adjustments obtained from pertinent market factors to derive adjusted new 'qu~ntita't'tve demand. In the case of Santa Aha, these adjustments include: (1) positive or negative altera-. tions in the exist'ing stock resulting from demolitions, version, and other factors associated with components of inventory changes; (2) an excess or ~ack of stock of existing housing, derived by a comparison of current available vacancy with the stimated vacancy requirement; and (3) an excess rate or lack of new construction as of th~-most recent survey date, derived by comparison with a.desirable rate considered adequate during the forecast period. In the present state of analytical science, these adjustments may be possible only with considerable margins of error. In the absence of reliable data, conservative judgement in estimation is desirable for the derivation of the permanent net quantitative demand for non-subsidized new sales and rental housing. ~ Table V-14 presents the projected gross demand for hous-' ing in Santa Aha. There are now more than 58,082 households in Santa Ana requiring 60,502 dwelling units to satisfy their housing needs, assuming.a healthy four percent vacancy. Currently these households are occupying only 59,992 units. By mid-1980, it is expected that there will be as many as 62,468 households. By 1990, there will be as many as 68,150 households, which will require 70,989 dwellings. Net increase.between 1974 and 1990 is therefore, estimated at 10,997, an increase of 18.3%. Such a' large growth in the number of households of all income levels will pose tremendous pressures for creation of sufficient hous- ing at costs that can be afforded by these households. If Santa Ana continues its defacto policy of capturing a dispro- portionate share of the Orange County Housing Market Area's' low-income households, substantial numbers of low-cost units will'have to be built or substantial numbers of households will have to be income subsidized to satisfy existing a.nd new demand and to house those low-income households which are at present underhoused. O00n8, :