what issues arise when a C corporation rents home to husband?

joint ownership of house husband has independent business whereby he provides services and is paid proportionately - independent of his wife who has a job at a law firm.. husband's corporation in which he owns 80% and a fellow provider owns 20% corporation rents full use of home as is necessary to handle occasional business visitors - use of office hallways at front door greeting biz folks -- bathrooms - screened porch - kitchen for meals occasionally with salesmen etc. - does books - makes phone calls using landline phone - uses home computer and equipment in three rooms plus front door and yard appearance etc. etc.