After several years of trying, a tech billionaire has finally won approval to rebuild a crumbling, 150-foot-long seawall that fronts his home overlooking Bolinas Beach. The wall will be narrower than the current structure but will include public benches and wheelchair access. At high tide, crossing over the seawall at the end of Brighton Avenue is the only way for visitors to get to the upcoast side of the beach. The wall, now more than 50 years old, is also a popular spot for people to hang out and take in the view. The California Coastal Commission approved the modified project last week, two years after the homeowner, Mark Pincus, filed a lawsuit against the commissioners asserting that they had not given him a fair hearing the first time. Mr. Pincus had proposed a wall that would have ranged from 7 feet deep at the Brighton Avenue end to 16 feet deep at the opposite end. In 2020, the commission approved a version that would have been 8 feet wide at both ends. Two years later, a Marin County judge ordered a new hearing, and the two sides agreed on a settlement providing for a 10-foot-deep wall with enough space for two public benches and wheelchair access. The additional two feet will push back into Mr. Pincus’s patio. One of the benches will be 50 feet long, the other 25 feet long. The agreement also requires Mr. Pincus to upgrade the run-down public viewing area overlooking the beach at the opposite corner of Brighton Avenue. The coastal commission generally looks askance at seawalls, arguing that they compound erosion and thus limit public access to the waterfront. But because Mr. Pincus’s home was built in the early 1900s, long before the California Coastal Act took effect in 1976, he was granted an exemption to armoring restrictions that apply to newer homes.