It helps to know that many landlord-tenant attorneys do initial consultations for free. Usually, a free consultation would last 30 minutes at most, and it could be facilitated by phone or in person. There are some attorneys who do virtual consultations, too.
For other consultations, lawyers may charge their regular hourly fee. Again, this varies depending on many factors, some of which are enumerated above. In the U.S., however, the average hourly rate of a landlord-tenant attorney is around $300.