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Texas & Mexico

About Tantum

Tantum Companies is a results-driven, one-stop solution for real estate. Whether you need a single service or a partner to manage the entire process as your single point of contact and deliver a finished project, our mission is to make real estate investing simple while increasing efficiency and reducing costs.

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How We Do It

We align an experienced in-house team with industry-leading partners—the best firms and specialists in their fields— to coordinate every detail, remove friction, and get projects across the finish line with speed, quality, and accountability.

Mission

Be the best option in real estate as a one-stop solution and single point of contact—from individual services to fully finished projects—improving efficiency, reducing costs, and creating lasting value for families, businesses, and investors.

Vision

Become the first name people think of when they think of real estate, recognized across Texas and Mexico for unifying development, brokerage, marketing, materials, and legal into one seamless, sustainable, and results-driven experience.

Purpose

Give clients confidence when making decisions while reducing risk caused by inefficiencies, poor communication, or unreliable companies—delivering clarity, expertise, and solutions that make real estate goals simple and achievable.

Our Team

Portrait of Rodrigo Camargo Agramonte

Rodrigo Camargo Agramonte – Founder, Tantum Companies

Rodrigo founded Tantum Companies with a clear mission: make real estate simpler and more profitable by unifying the process under one ecosystem—development, realty group, underwriting, marketing, materials, and cross-border coordination—so clients can move faster, reduce risk, and increase profitability. We do this by combining an experienced in-house team with industry-leading partners to deliver speed, quality, and accountability.

Hobbies & Passions: Family, nature, golf, MMA, snow skiing, sustainability, animals, building lasting relationships, and giving back to the community.

More on Rodrigo ›
Summary: Founder and owner-side real estate developer/advisor with 10+ years across Texas and Mexico, coordinating a $300M+ USD pipeline. Background spans acquisitions, capital coordination, underwriting/financial review, deal structuring, construction, and development—known for quarterbacking diligence and aligning scope and budgets through delivery. Focused on ocean- and environment-protective projects that strengthen local communities through low-impact, luxury sustainability.
Portrait of Derek Loebbecke

Derek Loebbecke – Co-Founder, Tantum Realty Group (Licensed Texas Broker)

Derek is the co-founder of Tantum Realty Group and a licensed Texas broker. He leads brokerage strategy and client representation across residential, commercial, land, and investment transactions—bringing disciplined execution and trusted guidance to every deal.

Hobbies & Passions: Golf, authentic relationships, connecting people, opportunity-making.

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Texas Real Estate Broker, Accredited Land Consultant (ALC) with 10+ years of professional experience and $50M+ in closed real estate transactions across Texas and Mexico. As Co-Founder and Brokerage Advisor of Tantum Realty Group, he leads U.S. and International operations specializing in high-value acquisitions and luxury properties. He has spearheaded complex deals involving over 5,000+ total acres, providing high-net-worth individuals with sophisticated, privacy-focused representation.
Portrait of Luis Frias

Luis Frias, CAM – Director of Real Estate Operations (COO)

Luis leads Tantum’s real estate operations, focused on scaling property management, driving clean execution, and supporting acquisitions and underwriting. Licensed since 2015, he built his foundation in multifamily investment sales, deal evaluation, and operations.

Hobbies & Passions: Family, working out, hiking, golf, fishing, and spending time with my wife and son.

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In 2019, Luis transitioned from broker to investor and operator, scaling to nearly 1,000 units under management and approximately $184M in assets under management across equity and debt investments. He holds the Certified Apartment Manager designation through the National Apartment Association and was named Independent Rental Owner of the Year by the San Antonio Apartment Association in 2025.
Portrait of Aaron Scott AJ

Aaron Scott “AJ” – Director of Pre-Development Services

AJ serves as Director of Pre-Development Services at Tantum, leading early-stage feasibility, zoning analysis, and construction alignment for residential and mixed-use projects. He helps investors and owners make faster go/no-go decisions by pressure-testing yield, entitlement risk, and early cost assumptions.

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With a background in architecture and real estate development, AJ specializes in site evaluation, density/yield analysis, entitlement strategy, and early construction feasibility. Prior to Tantum, he guided 300+ acre development deals and supported projects totaling $110M+ from land review through municipal coordination and concept refinement. He also oversees Tantum’s 3D visualization initiatives to help stakeholders clearly understand scope and design intent early.
Portrait of Roberto Camargo

Roberto Camargo – Legal & Compliance Director

With 40+ years in real estate law across Mexico, Roberto specializes in structuring deals, resolving disputes, and creating fideicomisos.

Hobbies & Passions: Family, dogs, nature, solving complex challenges others can’t.

Portrait of Pablo Escudero

Pablo Escudero – Mexico Broker, Tantum SA de CV (Mexico City)

Pablo is a broker in Mexico with offices in Mexico City. He leads cross-border transactions and residential/commercial acquisitions throughout Mexico, negotiating multi-million-dollar deals.

Hobbies & Passions: Family, innovative architecture, design, branding, marketing.

Portrait of Roberto C. Agramonte

Roberto C. Agramonte – Finance & Strategy

Roberto supports Tantum’s underwriting and investment decision-making through pro forma modeling and financial analysis for commercial and multifamily rental properties—helping investors evaluate returns, risk, and capital structure with clear, decision-ready assumptions.

Hobbies & Passions: Family, soccer, snow skiing, nature, animals, and reading.

More on Roberto ›
A Trinity University graduate in Economics & Finance (Series 7), Roberto builds transparent models for stabilized and value-add rentals, including hold-period cash flow projections, debt and financing scenarios, sensitivity analyses, and downside stress tests. He delivers concise summaries of key metrics so stakeholders can quickly assess feasibility and make informed go/no-go decisions.

Coldwell Banker D’Ann Harper, REALTORS® – Texas-Licensed Brokerage

Tantum Realty Group operates as a team at Coldwell Banker D’Ann Harper, REALTORS®. All Texas real estate brokerage services are provided through this Texas-licensed brokerage.

Portrait of Ashley Patrova

Ashley Patrova – Sales Coordinator

Ashley supports sales coordination and client experience across all divisions, ensuring every inquiry is handled with clarity, urgency, and a premium standard of service.

Hobbies & Passions: Family, gardening, structuring creative deals that become reality.

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Who We Partner With

US & MX

Survey & Engineering

Boundary/topo, civil, geotech, drainage, utilities, traffic, environmental.

US & MX

Architecture & General Contracting

Concept → CDs, permitting, competitive bids, site work, vertical delivery.

US & MX

Materials & Logistics

Aggregates, concrete, steel, finishes; schedule-safe procurement & logistics.

US & MX

Capital & Lending

Equity/debt guidance, JV structures, compliant presentation, take-outs.

US only

Title & Escrow

Underwriting, closing coordination, recordings, disbursements.

MX only

Notary Coordination

Coordinación con notaría para escrituración y cierre.

US & MX

Marketing & Sales Enablement

Brand, creative, paid media, sales ops, launch plans.

US & MX

Interior Design

Finish selections, FF&E, staging, procurement coordination, and unit/amenity programming.

US & MX

Property Management

HOA set-up, STR/long-term ops, reporting.

Partners

Texas real estate brokerage services are provided through Coldwell Banker D’Ann Harper, REALTORS® (Texas-licensed brokerage).

Case Studies

From Idea to Reality in 30 Days

Coordinated a full development package to accelerate investor decisions.

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  • Pro forma & underwriting
  • Construction budgets & feasibility
  • Market analysis & site plan
  • Photorealistic architectural renders
  • Branding system for the development

Materials Cost Control

Saved an average of 15% on flooring materials for a multifamily deal via vendor strategy and timing.

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Locked pricing windows, pre-approved alternates, and coordinated logistics to avoid change-order risk.

Cross-Border Close

Prevented a misstructured purchase, set up the client’s fideicomiso, and coordinated all legal requirements with MX notarías.

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Guided the buyer through compliant acquisition structure, bilingual documentation, and notary coordination to a clean closing.

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We prioritize partners with regional coverage, predictable timelines, and transparent pricing.