
http://www1.nyc.gov/site/planning/applicants/applicant-portal/step5-ulurp-actions.page
Underpinning – a solid foundation laid below ground level to support or strengthen a building
Different Types of Underpinning:
http://www.grainederainette.com/different-types-of-underpinning/
http://www.calculatorsoup.com/calculators/construction/feetandinches.php
2. Converting inches to decimal