We are in the middle of escrow and discovered an existing easement. The neighbor of the house we are buying owned the house we are buying at one point, so she owned adjacent houses. She later sold to the current seller. Prior to that sale, she created an easement for herself to use 15 feet of the land east of the house we are buying. We are okay with her using that 15 feet of land. We are, however, concerned because the easement agreement gives her exclusive use of the easement, and within this easement is a set of stairs attached to our house that leads to our back yard entrance. We would like to revise the agreement to legally allow us to use the stairs. Is it our duty as buyer to get a lawyer and revise easement? Or is it seller? Seller should deliver marketable title, correct?