[#1, #6, #21] Sub-level replica-apartment construction, soundproofing installation, and environmental/HVAC modifications (design, materials, structural work and integration).

[#29] Initial contingency reserve for unexpected research directions or rapid procurement of specialized equipment.

[#2, #3, #4, #5, #7, #8, #9, #10, #22] Reinforced interior doors and electronic locks, damage-resistant polycarbonate replacements, AV/screens/media servers (one-time hardware), wall-mounted electronic whiteboards, CCTV setup (initial hardware), UPS/generator setup, specialized restraints, initial PPE kits, and secure transport equipment/training.

[#19] One-time costs for initial background vetting, clearance enforcement setup, and policy/procedure configuration.

[#11, #12, #13, #14, #24] Salaries, benefits and secure-site premiums for security monitoring staff (Level 2/3 coverage), assigned therapist (daily sessions), pro-rated medical on-call/retainer, research staff allocations, and video/audio review analysts.

[#16, #17, #18] Advanced imaging and diagnostics sessions, chemical/pharmaceutical testing inventory, and data management/logging/analysis tool subscriptions and analyst time.

[#9, #10, #15] Replacement parts for restraints, PPE replacement cycles, and laboratory consumables for feeding/biochemical testing and single-use disposables.

[#28] Additional payroll/hazard differentials, temporary replacements and premiums for staff assigned to extreme working conditions.

[#4, #6, #8, #21, #25] AV licensing/maintenance, HVAC balancing/maintenance, UPS/generator periodic testing and fuel, environmental control maintenance, and routine repairs/depreciation of bolted furniture, locks and structural items.

[#26] Ongoing legal, administrative overhead and internal cover-story maintenance costs for secrecy and personnel restrictions.

[#20] Training for handling violent/self-harming subject, mandatory counseling, employee assistance programs, debriefing and burnout mitigation.

[#23] Stockpiled emergency materials, quarterly drills, rapid response readiness and consumables used during exercises.

[#29] Ongoing replenishment of research contingency fund as needed.

[#7] Recurring costs for encrypted storage, retention, redundant recording maintenance, and cybersecurity for surveillance systems.

[#19] Ongoing personnel vetting, clearance enforcement, HR administrative overhead, and maintenance of restricted lists.

[#27] Periodic audits of access to SCP-4020 records, secure archival, and compliance monitoring.