Evaluate apartment houses for sale in Southern California with a practical neighborhood and property due-diligence framework. Review rental demand, comparable properties, rent rolls, tenant protections, physical condition, operating expenses, capital needs, financing, and exit assumptions before relying on a pro forma. Use the field checklist to document evidence, stress-test projections, organize professional reviews, and compare opportunities consistently. This educational guide also explains why below-market rents are not automatic upside and why local market knowledge, inspections, legal review, and disciplined underwriting matter when assessing multifamily property risk and fit.