# Tenancy Law Practice Software Germany — Optimaite Law

Source: [https://www.optimaite.eu/en/law/fachgebiet/mietrecht](https://www.optimaite.eu/en/law/fachgebiet/mietrecht)

> From rental contract to eviction suit — AI knows §§535ff BGB and the Mietspiegel.

Optimaite Law reads residential and commercial leases, identifies invalid cosmetic-repairs clauses, tests rent increases against the local Mietspiegel and drafts eviction suits with current BGH line. WEG matters (resolution challenges, service-charge accounting) are fully covered.

## Signature workflows

### Rental-contract clause review

AI flags invalid clauses (cosmetic repairs, minor repairs, end-renovation) with BGH reasoning.

### Rent-increase test against Mietspiegel

Address + floor area + year of construction → AI fetches local Mietspiegel and checks if the increase falls within range.

### Eviction suit with enforcement motion

From termination ground (own use, arrears, breach) AI generates suit and eviction-title motion.

## Recommended modules
- [AI Brief Drafting](https://www.optimaite.eu/en/law/schriftsatz-ki) — AI drafts inside the document, with a BGH source behind every argument — your pen stays in your hand.
- [Case Management](https://www.optimaite.eu/en/law/aktenmanagement) — AI assigns matters and parties · detects deadlines · opens ticklers · measures realisation and utilisation — you run the mandate.
- [Billing & Accounting](https://www.optimaite.eu/en/law/rvg-abrechnung) — AI auto-bundles unbilled hours and expenses into batch invoices · checks subject value and frame fee · monitors dunning levels and default interest — you approve.

## Legal foundations & case law
- BGH VIII ZR — residential rentals
- §§535-580a BGB — rental contract
- §558 BGB — rent increase
- §543 BGB — extraordinary termination
- WEG §§ 23-29 — owner resolutions

## FAQs
### Are all Mietspiegel nationwide supported?

Yes. The AI accesses qualified Mietspiegel for major cities (Munich, Berlin, Hamburg, Cologne, Frankfurt etc.) plus simple Mietspiegel for smaller municipalities. Where no local table exists, comparable units from real-estate portals are used — with notice.

### Does Optimaite handle WEG resolution challenges?

Yes. From the owners' meeting protocol the AI recognises relevant resolutions, tests formal (§24 WEG) and substantive validity, and proposes a challenge under §§43, 44 WEG.