Against the land improvement failure.

… shall take necessary steps [actions] to ensure that no improvements erected on the land [area] adjacent to the Bank are altered [removed or interfered with]

The competent authorities should take the steps required to prevent disruption to landscaping work on the land directly adjacent to the Bank premises.

Maybe "improvement measures" or "restoration work", but "landscaping" probably covers it.

or warning measures against disturbances in the site/land improvements...

Disturbance:
perturbation: activity that is a malfunction, intrusion, or interruption;
An undesired change that takes place in a process(es) that tends to affect adversely the value of a controlled variable.
http://www.dynisco.com/glossary

Site improvements:
Improvements made to the land that may increase it’s value, such as water, sewer, landscaping and other utilities.
http://www.worldwidelandtransfer.com/real-estate-glossary/
Any sanitary sewerage system, storm sewer system, water supply and distribution systems, roadway, side-strip, sidewalk, pedestrian way, no-access strip, off-street parking area, lot grading, or other improvement, which may require
http://library.municode.com/HTML/14767/level4/CO_TIT17UNDEOR...

(site improvement) image examples:
http://ujmn.com/our-work/hagley-museum-and-library-site-impr...
http://rvhpa.org/uncategorized/whaleback-launch-improvements...

Competent authority takes appropriate preventive measures against any violation of urban landscaping (laws) at land sites adjacent to Bank's premises