AI Agent for Lease Management: Renewals, Terms, and Document Processing

The Lease Management Challenge

A property management company with 500 units has 500 active leases, each with different terms, renewal dates, and clauses. Tracking renewals, ensuring compliance with local regulations, and answering tenant or owner questions about specific lease terms is a full-time job. An AI lease management agent automates the repetitive parts: parsing documents, extracting terms, flagging upcoming renewals, and checking compliance.

Parsing Lease Documents

The foundation is extracting structured data from lease PDFs. We combine PDF text extraction with LLM-powered entity extraction.

import fitz  # PyMuPDF
from pydantic import BaseModel
from datetime import date
from typing import Optional

class LeaseTerms(BaseModel):
    tenant_name: str
    unit_number: str
    lease_start: date
    lease_end: date
    monthly_rent: float
    security_deposit: float
    pet_deposit: Optional[float] = None
    pet_policy: str
    early_termination_fee: Optional[float] = None
    renewal_notice_days: int
    parking_included: bool
    utilities_included: list[str]

def extract_text_from_pdf(pdf_path: str) -> str:
    """Extract all text content from a lease PDF."""
    doc = fitz.open(pdf_path)
    text = ""
    for page in doc:
        text += page.get_text()
    doc.close()
    return text

async def parse_lease_with_llm(
    lease_text: str,
    client,
) -> LeaseTerms:
    """Use an LLM to extract structured lease terms from raw text."""
    from agents import Agent, Runner

    extraction_agent = Agent(
        name="LeaseParser",
        instructions="""Extract lease terms from the provided text.
        Return structured data with all fields populated.
        If a field is not found in the lease, use reasonable defaults
        and flag it as uncertain.""",
        output_type=LeaseTerms,
    )
    result = await Runner.run(
        extraction_agent,
        input=f"Extract terms from this lease:\n\n{lease_text[:8000]}",
    )
    return result.final_output

Using Pydantic as the output_type ensures the LLM returns validated, typed data. The agent SDK handles the structured output formatting automatically.

Renewal Tracking System

With parsed lease data stored, we build a renewal monitoring tool.

from datetime import timedelta

@dataclass
class RenewalAlert:
    tenant_name: str
    unit: str
    lease_end: date
    days_until_expiry: int
    notice_deadline: date
    status: str  # upcoming, urgent, overdue

async def check_upcoming_renewals(
    pool,
    days_ahead: int = 90,
) -> list[RenewalAlert]:
    """Find all leases expiring within the specified window."""
    cutoff = date.today() + timedelta(days=days_ahead)
    rows = await pool.fetch("""
        SELECT tenant_name, unit_number, lease_end,
               renewal_notice_days
        FROM leases
        WHERE lease_end <= $1
          AND lease_end >= CURRENT_DATE
          AND renewal_status = 'pending'
        ORDER BY lease_end ASC
    """, cutoff)

    alerts = []
    for row in rows:
        days_left = (row["lease_end"] - date.today()).days
        notice_deadline = row["lease_end"] - timedelta(
            days=row["renewal_notice_days"]
        )
        if date.today() > notice_deadline:
            status = "overdue"
        elif days_left <= 30:
            status = "urgent"
        else:
            status = "upcoming"

        alerts.append(RenewalAlert(
            tenant_name=row["tenant_name"],
            unit=row["unit_number"],
            lease_end=row["lease_end"],
            days_until_expiry=days_left,
            notice_deadline=notice_deadline,
            status=status,
        ))
    return alerts

Compliance Checking

Different jurisdictions have different requirements for lease terms. The agent can validate leases against local regulations.

COMPLIANCE_RULES = {
    "CA": {
        "max_security_deposit_months": 1,  # AB 12 effective 2025
        "required_disclosures": [
            "lead_paint", "mold", "bed_bugs",
            "flood_zone", "demolition_intent",
        ],
        "max_late_fee_percent": 5.0,
    },
    "NY": {
        "max_security_deposit_months": 1,
        "required_disclosures": [
            "lead_paint", "bed_bug_history",
            "flood_zone", "sprinkler_system",
        ],
        "max_late_fee_percent": 5.0,
    },
}

def check_lease_compliance(
    terms: LeaseTerms,
    state: str,
    monthly_rent: float,
) -> list[str]:
    """Check lease terms against state regulations."""
    issues = []
    rules = COMPLIANCE_RULES.get(state)
    if not rules:
        return ["No compliance rules configured for this state."]

    max_deposit = monthly_rent * rules["max_security_deposit_months"]
    if terms.security_deposit > max_deposit:
        issues.append(
            f"Security deposit (${terms.security_deposit:,.0f}) exceeds "
            f"state maximum of {rules['max_security_deposit_months']} "
            f"month(s) rent (${max_deposit:,.0f})."
        )
    return issues if issues else ["Lease passes all compliance checks."]

The Lease Management Agent

from agents import Agent, function_tool

@function_tool
async def query_lease_terms(unit_number: str, question: str) -> str:
    """Look up specific lease terms for a given unit."""
    # In production, fetches parsed lease data from the database
    return f"Unit {unit_number} lease: Pet policy allows cats only, $300 deposit."

@function_tool
async def get_renewal_dashboard(days_ahead: int = 90) -> str:
    """Get a summary of upcoming lease renewals."""
    # Calls check_upcoming_renewals internally
    return (
        "3 renewals in next 90 days:\n"
        "- Unit 204 (Johnson): Expires Apr 15 - URGENT\n"
        "- Unit 118 (Patel): Expires May 1 - upcoming\n"
        "- Unit 305 (Garcia): Expires Jun 10 - upcoming"
    )

@function_tool
async def run_compliance_check(unit_number: str, state: str) -> str:
    """Run a compliance check on a lease against state regulations."""
    return "Lease passes all compliance checks for CA regulations."

lease_agent = Agent(
    name="LeaseManagementAgent",
    instructions="""You are a lease management assistant for property managers.
    Help with: looking up lease terms, tracking renewals,
    and checking compliance. Always recommend legal review
    for compliance edge cases.""",
    tools=[query_lease_terms, get_renewal_dashboard, run_compliance_check],
)

FAQ

Can the AI agent modify lease documents directly?

The agent should generate proposed changes as a marked-up draft, not modify the canonical lease document directly. All lease modifications must go through legal review and require both landlord and tenant signatures to be binding.

How reliable is LLM-based lease parsing?

For standard residential leases, extraction accuracy is typically above 95% for common fields like rent, dates, and deposit amounts. We recommend a validation step where a human reviews extracted terms before they enter the system of record.

How does the agent handle multi-year leases with escalation clauses?

The parser extracts escalation schedules (e.g., "3% annual increase") as structured data. The renewal tracker calculates the correct rent amount for each period and flags upcoming escalation dates alongside renewal deadlines.

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