Regional organizations often find themselves struggling to resolve conflicting national interests and goals. There are those who feel migration in the context of globalization is an issue that needs to be addressed on a global scale, while others believe that individual nation-states reserve the right and have the obligation to decide who crosses their borders, as well when and how.
A country would respect boundaries today if they have not changed. The line is the line no matter what and if the boundary between the countries exists it should respected by both sides as well as the rest of the world. Just because there is a hotel, the boundary is not negated.
Yes, countries respect boundaries today. If not, they would not exist. However, leaders in individual countries are also intelligent people who recognize that each situation is different and has to be handled in a unique way. Boundaries are not the only important factor in determining the best solution to a problem.
There are plenty of cities on the borders of countries and states all over the world. The borders of countries and states change over time. Whether its because one country has occupied or annexed a piece of another's land or some other reason. The buildings built on those borders don't matter.