In the intricate and dynamic sphere of law, there exist multifaceted niches that are often overlooked in mainstream discussions. One such niche, unique yet incredibly significant, is the realm of Building Collapse Lawyers. These specialized legal practitioners have carved out an indispensable role in our society, particularly in large urban areas where high-rise structures dominate the skyline.

Building Collapse Lawyers, as the moniker implies, provide legal expertise in cases involving the collapse or significant structural failure of buildings. Their role is to represent parties who have suffered physical or financial harm as a result of such incidents, which could range from individual tenants and property owners to construction companies, architects, and city municipalities.

To comprehend their modus operandi, we need to appreciate the complexity of the legal, architectural, and engineering aspects that come into play post a building collapse. The echoes of these cataclysmic events reverberate through the multi-faceted layers of law, insurance, property rights, and urban planning.

Upon examining the dynamics of building collapses, we start to unravel the gargantuan task that these lawyers undertake. It begins with establishing liability. The collapse of a building is a catastrophic event, often resulting in loss of life, severe injury, and immense property damage. It may be due to negligent construction, design flaws, subpar materials, or lack of maintenance. Therefore, attributing blame is a convoluted process involving the analysis of countless variables and interdependencies.

Once liability is established, comes the onerous task of calculating damages. This process involves valuing not just the physical property loss but also the collateral damage, which can include physical and emotional trauma, loss of income, and more. Here, statistical methodologies like regression analysis and predictive modeling are employed to quantify the intangible damages accurately. These complex calculations are critical in determining the quantum of compensation to be claimed.

Beyond damages, another issue that Building Collapse Lawyers tackle is social equity. In cases where a building collapse may displace residents, these legal practitioners may advocate for rights to housing and fair treatment. Utilizing knowledge from sociology and urban planning, they can argue for appropriate relocation and compensation for affected parties.

From a broader perspective, these lawyers also play a pivotal role in shaping building and construction regulations. Through their work, systemic flaws in building design, construction, and maintenance are exposed, often leading to enhanced regulations and safer urban habitats.

Here lies the dichotomy of their function. While they are reactive, stepping in post-crisis, they also possess a preventive role. By ensuring that negligent parties are held accountable, and damages are appropriately compensated, they serve as a deterrent to haphazard construction practices and lax regulatory oversight.

Building Collapse Lawyers have to traverse a matrix of law, engineering, economics, and social sciences to effectively execute their roles. They work at the intersection of these diverse domains, drawing on diverse bodies of knowledge to advocate for their clients. Their work is not just about securing monetary compensation; it's about upholding justice, ensuring accountability, advocating for safer practices, and ultimately, protecting our urban landscapes from preventable disasters.

In conclusion, Building Collapse Lawyers, though operating in a specialized niche, hold a significant position in our legal and societal framework. They illuminate the dark aftermath of building collapses and work tirelessly to ensure just outcomes in these complex, multifaceted situations. Their work, therefore, merits not only our understanding but also our utmost appreciation.