Legal Infrastructure Organizes Eviction: Evidence from Philadelphia

Marios Papamichalis; Regina Ruane

arxiv: 2604.21212 · v3 · pith:LMV7D463new · submitted 2026-04-23 · 📊 stat.AP

Legal Infrastructure Organizes Eviction: Evidence from Philadelphia

Marios Papamichalis , Regina Ruane This is my paper

Pith reviewed 2026-05-21 09:42 UTC · model grok-4.3

classification 📊 stat.AP

keywords evictionPhiladelphiaplaintiff attorneysrepeat filingslegal infrastructurecourt recordslandlord-tenantfiling patterns

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The pith

Eviction in Philadelphia is organized upstream by a small group of repeat plaintiff attorneys and recurring properties.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper examines nearly 750,000 landlord-tenant cases filed in Philadelphia Municipal Court from 1969 to 2022. It documents that ten attorneys handle 82 percent of represented plaintiff cases each year on average while large plaintiffs rely on their most-used attorney for 78 percent of their filings. Nearly half of all residential cases occur at addresses that saw a filing the prior year, and these repeat cases follow a more default-heavy path. The authors conclude that concentrated counsel, repeated addresses, and recurring tenant exposure produce filings as a patterned upstream process before any courtroom bargaining begins. A reader would care because the findings reframe eviction as an output of filing-side infrastructure rather than isolated disputes arising anew each time.

Core claim

Eviction in Philadelphia is organized upstream by a concentrated plaintiff-side bar, durable plaintiff-attorney dependence, repeated use of the same properties, and recurring tenant-name exposure. Between 1983 and 2022 the ten most active plaintiff attorneys handled 82.2 percent of represented plaintiff-side cases per year on average, compared with 14.8 percent for the ten most active plaintiffs. Large plaintiffs depend on one attorney for 78.3 percent of their filings on average. Across the residential universe 48.8 percent of cases occur at addresses with a prior filing in the preceding year and 23.6 percent at addresses with six or more prior filings; these repeats are usually filed by t

What carries the argument

The upstream legal infrastructure of concentrated plaintiff attorneys and repeated property-address filings that generates eviction cases before court involvement.

Load-bearing premise

The observed patterns of attorney concentration, plaintiff dependence, and repeated address filings reflect stable organizational infrastructure rather than unmeasured changes in property conditions, tenant populations, or local economic shocks.

What would settle it

Finding that repeat filing rates at the same addresses drop sharply after changes in property ownership or after major repairs would indicate that the patterns are driven by building or tenant factors instead of filing-side organization.

Figures

Figures reproduced from arXiv: 2604.21212 by Marios Papamichalis, Regina Ruane.

**Figure 1.** Figure 1: Concentration in the legal field. Plaintiff-side attorneys are substantially more concentrated view at source ↗

**Figure 2.** Figure 2: Plaintiff dependence and attorney brokerage. Large plaintiffs are tightly tied to one view at source ↗

**Figure 3.** Figure 3: Served-writ rate by address-churn bucket. The key churn gradient in the data is not a view at source ↗

**Figure 4.** Figure 4: Repeated units beyond the address. Plaintiff–attorney–property triads explain more view at source ↗

**Figure 5.** Figure 5: Stability of repeated attorney-pair outcome regimes. Repeated lawyer pairings reproduce view at source ↗

**Figure 6.** Figure 6: Attorney versus template structure in JBA text. Raw attorney heterogeneity in strictness view at source ↗

**Figure 7.** Figure 7: Fee-share and award-over-sought structure across actors, pairs, properties, and triads. view at source ↗

**Figure 8.** Figure 8: Coverage audit by module. The stable start years used in the paper follow the portions of view at source ↗

read the original abstract

We analyze the filing-side legal infrastructure of eviction using 755,004 Philadelphia Municipal Court landlord-tenant records filed between 1969 and 2022, of which 747,125 are residential. Eviction in Philadelphia is organized upstream by a concentrated plaintiff-side bar, durable plaintiff-attorney dependence, repeated use of the same properties, and recurring tenant-name exposure. Between 1983 and 2022, the ten most active plaintiff attorneys handled 82.2% of represented plaintiff-side cases per year on average, compared with 14.8% for the ten most active plaintiffs. Large plaintiffs depend heavily on a single attorney: among plaintiffs filing at least 101 cases, 78.3% of each plaintiff's filings are handled by that plaintiff's most-used attorney, on average. Repetition is likewise central to the docket. Across the residential filing universe, 48.8% of cases occur at addresses with a prior filing in the preceding year, and 23.6% at addresses with six or more prior filings; these repeats are usually filed by the same plaintiff and follow a more default-heavy, less agreement-heavy pathway. We further examine a narrower mechanism: strict switches into specialist plaintiff-side counsel, defined as a plaintiff changing attorney to one in the prior-year top ten. Filing counts rise around the switch with non-flat pre-trends, indicating organizational reconfiguration rather than a clean exogenous shock. Within-plaintiff and within-plaintiff-property comparisons yield more stable estimates: judgment by agreement, fee share, waiver language, and corrected lockout-trigger language decline, while deadline language rises. We interpret eviction as a layered upstream process in which concentrated counsel, repeated places, and recurring tenants produce filings before any courtroom bargaining or adjudication occurs.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Philadelphia eviction data shows clear attorney concentration and address/tenant repeats from a large court file, but the switch analysis does not cleanly separate attorney effects from other changes.

read the letter

The main thing to know is that this paper uses a big set of Philadelphia Municipal Court records to document how a handful of attorneys handle most eviction cases and how often the same addresses and tenants appear repeatedly. The top ten plaintiff attorneys cover 82 percent of represented cases on average, large filers stick with one main lawyer for 78 percent of their work, and nearly half the residential cases hit addresses with a prior filing in the last year. Those repeats tend to come from the same plaintiff and run on a more default-oriented track. These are direct counts from the administrative data, not fitted results, so the patterns are straightforward to verify. The scale of the file, spanning 1969 to 2022, gives a long view that prior work on eviction dockets has not matched in this detail. The switch analysis is the softer part. Plaintiffs who move to a top-ten attorney show drops in judgment-by-agreement rates and some language shifts in the within-plaintiff and within-property comparisons. Filing volume trends upward before the switch, though, which means the estimates do not rule out time-varying property conditions or tenant turnover as drivers of both the attorney change and the outcome differences. The paper notes the pre-trends but the mechanism stays suggestive. Readers who study housing courts, tenant protections, or the organization of civil dockets will get the most from the descriptive numbers. It is not a heavy causal paper, so it fits best as evidence on upstream structure rather than proof of specific attorney impacts. I would bring it to a reading group to discuss the data construction and what the repeats imply for screening practices. The dataset size and the concrete Philadelphia facts are enough to send it for peer review. Recommend sending it out, with referees asked to focus on tightening the limits section around the switch results.

Referee Report

2 major / 2 minor

Summary. The paper analyzes 755,004 Philadelphia Municipal Court landlord-tenant filings (747,125 residential) from 1969-2022 and claims that eviction is organized upstream by a concentrated plaintiff-side bar, durable plaintiff-attorney dependence, repeated property filings, and recurring tenant-name exposure. It reports that the top ten plaintiff attorneys handle 82.2% of represented cases on average (vs. 14.8% for top plaintiffs), that large plaintiffs route 78.3% of filings to their most-used attorney, that 48.8% of residential cases occur at addresses with a filing in the prior year, and that attorney switches to prior-year top-ten counsel are associated with shifts in judgment-by-agreement rates, fee shares, and filing language in within-plaintiff and within-plaintiff-property comparisons.

Significance. If the descriptive patterns and within comparisons hold after addressing pre-trend and confounder concerns, the work would supply large-scale administrative evidence that eviction dockets are shaped by stable legal infrastructure on the filing side rather than solely by case-by-case adjudication. The scale of the court records and the focus on plaintiff-side concentration and repetition constitute clear strengths for an applied statistics audience.

major comments (2)

[switch analysis / narrower mechanism section] The switch analysis reports non-flat pre-trends in filing counts and relies on within-plaintiff and within-plaintiff-property comparisons to identify changes in judgment-by-agreement, fee share, and language. These comparisons do not rule out time-varying confounders such as building deterioration or tenant-composition shifts that could jointly drive the attorney switch and the observed filing changes, weakening the claim that the patterns reflect stable organizational infrastructure.
[abstract and repetition results] The central interpretation that 48.8% address-level repeats and recurring tenant names are produced by plaintiff-attorney filing infrastructure (rather than selection into high-default properties or tenant populations) rests on the within comparisons; because those comparisons leave open the listed confounders, the upstream-organization claim is not yet fully secured by the reported evidence.

minor comments (2)

[methods / data construction] Clarify the exact definition and construction of 'strict switches into specialist plaintiff-side counsel' and how the top-ten threshold is applied year-by-year.
[concentration results] The paper would benefit from a table or figure showing the distribution of plaintiff filing volumes to contextualize the 78.3% dependence statistic.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed and constructive report. We address each major comment below, noting planned revisions where appropriate.

read point-by-point responses

Referee: [switch analysis / narrower mechanism section] The switch analysis reports non-flat pre-trends in filing counts and relies on within-plaintiff and within-plaintiff-property comparisons to identify changes in judgment-by-agreement, fee share, and language. These comparisons do not rule out time-varying confounders such as building deterioration or tenant-composition shifts that could jointly drive the attorney switch and the observed filing changes, weakening the claim that the patterns reflect stable organizational infrastructure.

Authors: We agree that within-plaintiff and within-plaintiff-property fixed effects cannot eliminate all time-varying confounders, including possible changes in building conditions or tenant populations that coincide with attorney switches. The manuscript already flags the non-flat pre-trends in filing counts and interprets them as evidence of organizational reconfiguration rather than an exogenous shock. In revision we will expand the discussion of the narrower mechanism section to state these limitations explicitly, reframe the within comparisons as isolating changes associated with switches to specialist counsel while acknowledging that residual confounding remains possible, and avoid stronger causal language about stable infrastructure. No additional data on building deterioration or tenant composition are available in the court records, so we cannot conduct further robustness checks on those dimensions. revision: partial
Referee: [abstract and repetition results] The central interpretation that 48.8% address-level repeats and recurring tenant names are produced by plaintiff-attorney filing infrastructure (rather than selection into high-default properties or tenant populations) rests on the within comparisons; because those comparisons leave open the listed confounders, the upstream-organization claim is not yet fully secured by the reported evidence.

Authors: The descriptive evidence on plaintiff concentration, durable attorney dependence, and address- and tenant-level repetition is presented separately from the switch analysis and does not rely on the within comparisons. The switch results are offered only as narrower supporting evidence of changes in filing practices. We will revise the abstract and the interpretation paragraphs to clarify this distinction, emphasize the descriptive patterns of upstream organization, and qualify the switch findings as suggestive rather than conclusive. This will align the language more closely with the identification limits noted by the referee. revision: yes

Circularity Check

0 steps flagged

No circularity: direct empirical tabulation of administrative records

full rationale

The paper computes descriptive shares (82.2% attorney concentration, 78.3% plaintiff dependence, 48.8% address repeats) and reports within-plaintiff and within-plaintiff-property changes around attorney switches directly from the 755,004 court records. These quantities are calculated from the raw filing data without any fitted parameters, self-referential equations, or load-bearing self-citations that would make the reported patterns equivalent to their inputs by construction. The central claims are therefore self-contained empirical summaries rather than derivations that collapse into prior assumptions.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that court filing records are complete and that observed patterns indicate organizational infrastructure rather than confounding factors.

axioms (1)

domain assumption Philadelphia Municipal Court records accurately capture all filed landlord-tenant cases without significant missing data or systematic errors.
The analysis uses the full set of 755,004 records as the population of interest.

pith-pipeline@v0.9.0 · 5845 in / 1148 out tokens · 42911 ms · 2026-05-21T09:42:16.458833+00:00 · methodology

Review history (3 revisions) →

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Foundation/RealityFromDistinction.lean reality_from_one_distinction unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

Eviction in Philadelphia is organized upstream by a concentrated plaintiff-side bar, durable plaintiff-attorney dependence, repeated use of the same properties, and recurring tenant-name exposure. ... 48.8% of cases occur at addresses with a prior filing in the preceding year...
IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

Within-plaintiff and within-plaintiff–property comparisons yield more stable estimates: judgment by agreement, fee share, waiver language, and corrected lockout-trigger language decline...

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

High-Volume Plaintiff-Side Counsel and Single-Appearance Eviction Cases in Philadelphia
stat.AP 2026-05 unverdicted novelty 5.0

High-volume plaintiff-side counsel in Philadelphia eviction cases scales up filing volume and procedural steps but does not produce a broad premium on adverse tenant outcomes such as default or judgment.

Reference graph

Works this paper leans on

4 extracted references · 4 canonical work pages · cited by 1 Pith paper

[1]

we go totally subjective

[A. Hoffman and Strezhnev, 2023] A. Hoffman, D. and Strezhnev, A. (2023). Longer trips to court cause evictions.Proceedings of the National Academy of Sciences, 120(2):e2210467120. [Aizman and Huntley, 2025] Aizman, A. and Huntley, E. R. (2025). Shadow players of the eviction crisis: identifying and characterizing professional evicting attorneys in massac...

work page 2023
[2]

and Pasciuti, D

[Sudeall and Pasciuti, 2021] Sudeall, L. and Pasciuti, D. (2021). Praxis and paradox: Inside the black box of eviction court.Vand. L. Rev., 74:1365. [Summers, 2022] Summers, N. (2022). Eviction court displacement rates.Nw. UL REv., 117:287. [Summers, 2023] Summers, N. (2023). Civil probation.Stan. L. Rev., 75:847. [Summers, 2026] Summers, N. (2026). Settl...

work page 2021
[3]

A supplementary coverage audit sharpens that point

All descriptive quantities are summaries of the observed administrative record, while model-based analyses are interpreted associationally unless the design explicitly compares the same plaintiff or the same plaintiff–property unit over time. A supplementary coverage audit sharpens that point. In usable-share terms, the stable windows begin in 1983 for pl...

work page 1983
[4]

The point is not a simple upward trend

Award-to-request ratios exceed unity in every modern year shown, indicating that court-imposed debt frequently exceeds the amount originally sought. The point is not a simple upward trend. It is that fee-augmented debt remains a material component of court processing across the modern period (Table D3; Figure D1). Table D3: Selected fee-extraction statist...

work page 2004

[1] [1]

we go totally subjective

[A. Hoffman and Strezhnev, 2023] A. Hoffman, D. and Strezhnev, A. (2023). Longer trips to court cause evictions.Proceedings of the National Academy of Sciences, 120(2):e2210467120. [Aizman and Huntley, 2025] Aizman, A. and Huntley, E. R. (2025). Shadow players of the eviction crisis: identifying and characterizing professional evicting attorneys in massac...

work page 2023

[2] [2]

and Pasciuti, D

[Sudeall and Pasciuti, 2021] Sudeall, L. and Pasciuti, D. (2021). Praxis and paradox: Inside the black box of eviction court.Vand. L. Rev., 74:1365. [Summers, 2022] Summers, N. (2022). Eviction court displacement rates.Nw. UL REv., 117:287. [Summers, 2023] Summers, N. (2023). Civil probation.Stan. L. Rev., 75:847. [Summers, 2026] Summers, N. (2026). Settl...

work page 2021

[3] [3]

A supplementary coverage audit sharpens that point

All descriptive quantities are summaries of the observed administrative record, while model-based analyses are interpreted associationally unless the design explicitly compares the same plaintiff or the same plaintiff–property unit over time. A supplementary coverage audit sharpens that point. In usable-share terms, the stable windows begin in 1983 for pl...

work page 1983

[4] [4]

The point is not a simple upward trend

Award-to-request ratios exceed unity in every modern year shown, indicating that court-imposed debt frequently exceeds the amount originally sought. The point is not a simple upward trend. It is that fee-augmented debt remains a material component of court processing across the modern period (Table D3; Figure D1). Table D3: Selected fee-extraction statist...

work page 2004