LandMark Associates of DE, Inc. Real Estate Evaluation & Consulting Established in 1993, LandMark Associates is a family-owned and operated business that provides appraisal and consulting services for residential and commercial properties throughout the Sussex County, Delaware area. LandMark Associates of DE, Inc. is a non-affiliated residential real estate appraisal and consulting firm specializing in "legal" purposes. Our group of appraisers and associates have earned a reputation for preparing accurate and thorough evaluations in a diverse and rapidly expanding real estate market. Serving the Southern Delaware Market Area since 1993 (302) 645-7070