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DC Inclusionary Zoning Deal Math for Small Developers
By Jason Taken · Principal, Jaken Finance Group
DC Inclusionary Zoning (IZ) for investors — 8–10% set-aside on 10+ unit projects, CIZC timeline, DHCD lottery delay, and DSCR impact on condo conversion and infill.
Inclusionary Zoning (IZ) is the District’s affordable set-aside program — and it is the reason a 12-unit condo conversion or small office-to-residential file pencils differently than the same square footage in Arlington. When a project creates 10 or more units, DHCD typically requires 8–10% of residential floor area as affordable housing, priced off a Maximum Income, Rent and Purchase Price Schedule, delivered through a Certificate of Inclusionary Zoning Compliance (CIZC) and DHCD lottery process.
This is deal math for small sponsors — not LIHTC syndication. Pair with condo conversion financing, spec home / new construction DC, and office-to-residential playbook.
Official reference: DHCD — Inclusionary Zoning for Residential Developers
When IZ triggers — investor screening
| Project type | Typical IZ exposure |
|---|---|
| Ground-up 10+ units | Yes — standard set-aside |
| Rehab creating 10+ units | Yes — includes large rowhouse stack + ADU count |
| Condo conversion to 10+ units | Yes — conversion checklist |
| Small office-to-residential (4–20 units) | Maybe — count units after conversion |
| 9-unit infill | No IZ — still watch BEPS and HPRB |
Not the same as: Section 8 / HAP (tenant-based subsidy) or HID tax abatement (downtown incentive stack).
IZ process — where calendar meets construction interest
DHCD and DOB share the workflow (DHCD IZ developers page):
| Step | Agency | Investor cost |
|---|---|---|
| Zoning + building permit path | DOB / OP | Standard permit fees |
| CIZC approval | DOB + DHCD | Legal + architect |
| Notice of Availability (NOA) | DHCD | ~60 days before first CO on some paths |
| Income certification + lottery | DHCD | Admin + marketing delay |
| Recorded IZ covenant | Title | Restricts resale/rent on set-aside units |
| Market units lease/sell | Sponsor | After affordable placement rules satisfied |
Construction loan carry: New construction loans DC at 8.99%–13.5% accrue IO while DHCD processes NOA — a 3-month lottery slip on a $2.8M note costs ~$70K–$98K interest alone.
Rent and price caps — DSCR numerator impact
IZ units rent or sell at the greater of schedule caps tied to CIZC date or NOA receipt — not Zillow market rent.
Worked example — 12-unit conversion, Petworth corridor
| Line | Market units (10) | IZ units (2) |
|---|---|---|
| Unit type | 1BR/2BR mix | 1BR IZ |
| Market rent (2026 comp) | $2,100 / $2,850 avg | — |
| IZ schedule rent (illustrative) | — | $1,450 / $1,750 |
| Monthly gross if all market | $27,800 | — |
| Actual with 2 IZ | $24,550 | |
| Monthly IZ haircut | -$3,250 |
DSCR impact: On $3.36M stabilized value at 70% LTV ($2.35M loan @ 8.75%), PITIA ≈ $15,500/mo.
- All-market pro forma $27.8K gross → thin 1.05 DSCR with aggressive expenses
- IZ-adjusted $24.55K gross → ~0.93 DSCR — fails without lower LTV or higher market-unit mix
Run your file on the DSCR calculator with actual IZ schedule — not broker OM.
Condo conversion — IZ vs fee-simple flip
Rowhouse condo conversion math often assumes uniform sale prices. IZ splits the exit:
| Exit path | IZ effect |
|---|---|
| Sell market condos | IZ units sell at capped prices — lower blended $/sf |
| Hold rental portfolio | IZ units cap NOI permanently on recorded covenant |
| Bridge to DSCR | Underwriter uses executed or scheduled IZ rents on set-aside doors |
Condo conversion financing DC · DSCR condos
Office-to-residential — small sponsor lane
Office-to-residential wave covers institutional C-PACE and HID — small 10–20 unit conversions still hit IZ when unit count qualifies. Budget:
- Affordable unit finish — cannot always use cheapest spec if DHCD standards apply
- Separate metering / access — IZ units may need distinct entrances or common-area sharing per approval
- Extended construction loan — bridge mixed-use DC
Financing checklist — before you lock land or shell
- Unit count post-conversion — include legal ADUs and basements with CO
- Pull current IZ Maximum Income, Rent and Purchase Price Schedule from DHCD
- Model 8% and 10% set-aside scenarios on floor area — not just unit count
- Add 90–120 days DHCD process to construction timeline
- Record IZ covenant in title pro forma — affects resale and refi
- Confirm CIZC milestone in draw schedule with lender
- Compare Arlington/Bethesda non-IZ basis — DMV cross-border
When IZ makes the deal better
- Long-hold affordable specialist — stable HAP-adjacent demand, less merchant-build risk
- Hybrid with market units — 10-unit stack with 1 IZ hurts less than 2 of 12
- Ground-up with pre-sold market — if lottery clears before CO, carry shortens
When to walk
- Thin DSCR that only works if IZ units achieve market rent — they will not
- 6-month construction loan on 12-unit first-time IZ sponsor
- Condo exit requiring $900K+ average sale price with 2 IZ caps below $400K
Ground-up 14-unit — full carry stack
Profile: Eckington infill, 14 units, 10% IZ floor area ≈ 1–2 affordable units.
| Line | Amount |
|---|---|
| Land + shell | $1.85M |
| Hard + soft construction | $2.4M |
| Total basis | ~$4.25M |
| Construction loan @ 11% IO, 14 months | ~$544K interest |
| IZ lottery + NOA delay (+3 months) | ~$117K additional IO |
| IZ calendar premium | ~$117K |
Stabilized market gross $42K/mo minus IZ haircut ~$2.8K/mo → $39.2K/mo. DSCR at 65% LTV on $4.8M appraised may clear 1.02 — only if DHCD lottery clears on schedule. Compare Bethesda infill without IZ on same sponsor capital.
Pop-up + unit count — when rowhouse becomes IZ
Pop-up and third-story additions can push a single rowhouse portfolio from 8 units across two buildings to 11 units in one rehabilitation — triggering IZ on the rehab permit, not the original acquisition. Count legal CO-backed units after work, not before.
CIZC checklist — sponsor-facing
| Milestone | Owner | Document |
|---|---|---|
| Zoning confirmation | Architect / land use counsel | Zoning report |
| CIZC application | Sponsor + architect | DOB filing |
| IZ set-aside on plans | Architect | Floor plans flagged |
| NOA to DHCD | Sponsor | 60-day clock |
| Lottery / certification | DHCD | Tenant income files |
| Recorded covenant | Title | Schedule B item |
| Market unit CO | DOB | Per-unit release |
Missing recorded covenant kills condo registration and DSCR refi — title company must track.
IZ rent schedule — how to underwrite without guessing
Pull the current Maximum Income, Rent and Purchase Price Schedule from DHCD IZ page. Underwrite:
- Greater of schedule rent at CIZC approval or NOA receipt
- Income limits for lottery marketing — affects tenant pool, not your construction loan
- Resale caps on IZ condos — affects blended exit price
Never use Zillow market rent on IZ doors in a DSCR pro forma — underwriters will strip it.
Draw schedule — construction lender coordination
| Draw | Release | IZ gate |
|---|---|---|
| Foundation / shell | 25% | IZ units framed per plan |
| MEP rough | 25% | Separate metering if required |
| Drywall / finish | 30% | IZ unit finish meets DHCD spec |
| CO / stabilization | 20% | NOA cleared, lottery complete |
Lenders on new construction DC may hold final 10–15% until IZ placement — negotiate upfront.
DMV comparison — why sponsors look at Maryland
Montgomery County and Arlington do not run DC’s IZ program on the same terms. A 12-unit conversion in Silver Spring may avoid 8–10% set-aside while capturing Metro spillover rent. Tradeoff: different basis, tax, and tenant law — cross-border guide.
IZ + other DC stacks — cumulative delay
IZ rarely arrives alone on 10+ unit work:
| Program | Adds |
|---|---|
| HPRB | 4–12 weeks on exterior |
| BEPS | Systems capex on 5+ |
| DOPA | If affordable mix already high |
| TOPA | If occupied during conversion |
Stack calendars — do not sum “best case” from each guide.
Second DSCR scenario — hold 12-unit, no condo exit
Stabilized value: $3.36M · 2 IZ units @ $1,600/mo avg · 10 market @ $2,750/mo avg
| Line | Value |
|---|---|
| Gross | $30,700/mo |
| OpEx (35%) | $10,745/mo |
| NOI | $19,955/mo |
| PITIA @ 65% LTV, 8.75% | ~$15,500/mo |
| DSCR | ~1.29 — passes many desks |
Same building at all-market $33K/mo gross → DSCR ~1.35. IZ haircut costs ~0.06 DSCR — material but not always fatal on hold; fatal on thin condo flip.
IZ — construction financing gates (2026)
- Pull current IZ schedule before LOI on 10+ unit scope
- Model +90 days DHCD on every first-time IZ sponsor
- Record covenant in title pro forma
- Negotiate interest reserve for lottery delay
- Compare non-IZ DMV exit if DSCR only works at market rents on 100% of doors
First-time IZ sponsor — realistic timeline
Budget 18–24 months from land control to stabilized market lease on a 12-unit first project: 6–8 months construction, 3–4 months DHCD lottery and IZ placement, 2–3 months market unit lease-up, plus HPRB/BEPS if applicable. Sponsors who underwrite 12-month merchant build on inaugural IZ files run out of construction loan term before the first market tenant signs — negotiate extensions at LOI, not at maturity.
Pair with spec home construction DC for draw discipline and bridge mixed-use when office shell conversion spans two calendar years.
Disclaimer: IZ rules and schedules change. This is educational deal math — retain zoning and DHCD counsel.
Related: Spec home construction DC · Popup/third story financing · Permits guide
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