You can safely erect 30+- feet of Rohn 25 without guy wires as long as you don't overload it with large antenna/s with high wind loads. A vertical or three has very little wind loading.
Safely anchoring to a building is going to depend on the construction of the building. Lag bolts going into siding and OSB or solid board sheathing is not adequate.
It should be through bolted to 2X lumber, attached to the framing members inside the wall at or near the top plate of the wall to spread any lateral load for maximum strength. Towers do move and twist in the wind however slightly and will eventually work poor attaching hardware loose.
If you're only going to use 36' and a few VHF/UHF antennas, and maybe a center point for a dipole, you should be fine with a concrete base and house bracket that's properly secured.
Remember to place it away from power lines (including the service drop if present) to provide an adequate potential fall zone if it ever came down in high winds. Double the height of the antenna away is usually a standard safe distance if you can achieve it.