A realtor's commission on a property sale of $500,000 would be around 5% to 6% of the sale price, which would be $25,000 to $30,000. This amount is typically split between the seller's agent and the buyer's agent, so the seller would pay $12,500 to $15,000 in realtor fees. However, it's important to note that commission rates can vary depending on the location, type of property, and the agent's experience, so the actual commission may be higher or lower than this range.