Individual Lease: $475 per month. Spacious Floor Plans with Room to Spare, Newly Remodeled Units, Upgraded Counters & Countertops, Faux Wood Flooring, Space Saver Microwave, and Built-In Bookshelves. Treehouse offers off campus housing for college students in San Marcos, Texas near TSU. Make Treehouse your home! Treehouse Apartments offers one and two bedroom apartment homes for rent in San Marcos, TX. We offer central heat/ air conditioning, full appliances with refrigerators, dishwashers, and microwaves with a private patio or balcony. Our community features a pool and clubroom. Treehouse Apartments is the closest community to Texas State University. We are right across the street, less than a 2 minute walk to campus. We are pet friendly and allow fish, cats and dogs without a weight limit.