See https://www.irs.gov/publications/p527#en_US_2020_publink1000218997
Travel expenses.
You can deduct the ordinary and necessary expenses of traveling away from home if the primary purpose of the trip is to collect rental income or to manage, conserve, or maintain your rental property. You must properly allocate your expenses between rental and nonrental activities. You can’t deduct the cost of traveling away from home if the primary purpose of the trip is to improve the property.
